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href="#Use"> <div class="vector-toc-text"> 3 Use </div> </a> <ul id="toc-Use-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Criticism" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Criticism"> <div class="vector-toc-text"> 4 Criticism </div> </a> <button aria-controls="toc-Criticism-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Criticism subsection </button> <ul id="toc-Criticism-sublist" class="vector-toc-list"> <li id="toc-Inapplicability_of_impact_factor_to_individuals_and_between-discipline_differences" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Inapplicability_of_impact_factor_to_individuals_and_between-discipline_differences"> <div class="vector-toc-text"> 4.1 Inapplicability of impact factor to individuals and between-discipline differences </div> </a> <ul id="toc-Inapplicability_of_impact_factor_to_individuals_and_between-discipline_differences-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Questionable_editorial_policies_that_affect_the_impact_factor" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Questionable_editorial_policies_that_affect_the_impact_factor"> <div class="vector-toc-text"> 4.2 Questionable editorial policies that affect the impact factor </div> </a> <ul id="toc-Questionable_editorial_policies_that_affect_the_impact_factor-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Assumed_correlation_between_impact_factor_and_quality" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Assumed_correlation_between_impact_factor_and_quality"> <div class="vector-toc-text"> 4.3 Assumed correlation between impact factor and quality </div> </a> <ul id="toc-Assumed_correlation_between_impact_factor_and_quality-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Negotiated_values" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Negotiated_values"> <div class="vector-toc-text"> 4.4 Negotiated values </div> </a> <ul id="toc-Negotiated_values-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Distribution_skewness" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Distribution_skewness"> <div class="vector-toc-text"> 4.5 Distribution skewness </div> </a> <ul id="toc-Distribution_skewness-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Reproducibility" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Reproducibility"> <div class="vector-toc-text"> 4.6 Reproducibility </div> </a> <ul id="toc-Reproducibility-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Broader_negative_impact_on_science" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Broader_negative_impact_on_science"> <div class="vector-toc-text"> 4.7 Broader negative impact on science </div> </a> <ul id="toc-Broader_negative_impact_on_science-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Institutional_responses_to_criticism_of_the_impact_factor" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Institutional_responses_to_criticism_of_the_impact_factor"> <div class="vector-toc-text"> 5 Institutional responses to criticism of the impact factor </div> </a> <ul id="toc-Institutional_responses_to_criticism_of_the_impact_factor-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Related_indices" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Related_indices"> <div class="vector-toc-text"> 6 Related indices </div> </a> <button aria-controls="toc-Related_indices-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Related indices subsection </button> <ul id="toc-Related_indices-sublist" class="vector-toc-list"> <li id="toc-Other_measures_of_scientific_impact" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Other_measures_of_scientific_impact"> <div class="vector-toc-text"> 6.1 Other measures of scientific impact </div> </a> <ul id="toc-Other_measures_of_scientific_impact-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Counterfeit_impact_factors" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Counterfeit_impact_factors"> <div class="vector-toc-text"> 6.2 Counterfeit impact factors </div> </a> <ul id="toc-Counterfeit_impact_factors-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> 7 See also </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notes_on_alternatives" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes_on_alternatives"> <div class="vector-toc-text"> 8 Notes on alternatives </div> </a> <ul id="toc-Notes_on_alternatives-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> 9 References </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Further_reading" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Further_reading"> <div class="vector-toc-text"> 10 Further reading </div> </a> <ul id="toc-Further_reading-sublist" class="vector-toc-list"> </ul> 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</div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading">Impact factor</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 41 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-41" aria-hidden="true" > 41 languages </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B9%D8%A7%D9%85%D9%84_%D8%A7%D9%84%D8%AA%D8%A3%D8%AB%D9%8A%D8%B1" title="عامل التأثير – Arabic" lang="ar" hreflang="ar" data-title="عامل التأثير" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target">العربية</a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/%C4%B0mpakt_faktor" title="İmpakt faktor – Azerbaijani" lang="az" hreflang="az" data-title="İmpakt faktor" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target">Azərbaycanca</a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%98%D0%BC%D0%BF%D0%B0%D0%BA%D1%82_%D1%84%D0%B0%D0%BA%D1%82%D0%BE%D1%80" title="Импакт фактор – Bulgarian" lang="bg" hreflang="bg" data-title="Импакт фактор" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target">Български</a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/%C3%8Dndex_d%27impacte" title="Índex d'impacte – Catalan" lang="ca" hreflang="ca" data-title="Índex d'impacte" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target">Català</a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Impakt_faktor" title="Impakt faktor – Czech" lang="cs" hreflang="cs" data-title="Impakt faktor" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target">Čeština</a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/I-faktoren" title="I-faktoren – Danish" lang="da" hreflang="da" data-title="I-faktoren" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target">Dansk</a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Impact_Factor" title="Impact Factor – German" lang="de" hreflang="de" data-title="Impact Factor" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target">Deutsch</a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/M%C3%B5jutegur" title="Mõjutegur – Estonian" lang="et" hreflang="et" data-title="Mõjutegur" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target">Eesti</a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%94%CE%B5%CE%AF%CE%BA%CF%84%CE%B7%CF%82_%CE%B1%CF%80%CE%AE%CF%87%CE%B7%CF%83%CE%B7%CF%82" title="Δείκτης απήχησης – Greek" lang="el" hreflang="el" data-title="Δείκτης απήχησης" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target">Ελληνικά</a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Factor_de_impacto" title="Factor de impacto – Spanish" lang="es" hreflang="es" data-title="Factor de impacto" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target">Español</a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Inpaktu-faktore" title="Inpaktu-faktore – Basque" lang="eu" hreflang="eu" data-title="Inpaktu-faktore" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target">Euskara</a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B6%D8%B1%DB%8C%D8%A8_%D8%AA%D8%A3%D8%AB%DB%8C%D8%B1" title="ضریب تأثیر – Persian" lang="fa" hreflang="fa" data-title="ضریب تأثیر" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target">فارسی</a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Facteur_d%27impact" title="Facteur d'impact – French" lang="fr" hreflang="fr" data-title="Facteur d'impact" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target">Français</a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%94%BC%EC%9D%B8%EC%9A%A9%EC%A7%80%EC%88%98" title="피인용지수 – Korean" lang="ko" hreflang="ko" data-title="피인용지수" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target">한국어</a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B1%D5%A6%D5%A4%D5%A5%D6%81%D5%B8%D6%82%D5%A9%D5%B5%D5%A1%D5%B6_%D5%A3%D5%B8%D6%80%D5%AE%D5%B8%D5%B6" title="Ազդեցության գործոն – Armenian" lang="hy" hreflang="hy" data-title="Ազդեցության գործոն" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target">Հայերեն</a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/%C4%8Cimbenik_odjeka" title="Čimbenik odjeka – Croatian" lang="hr" hreflang="hr" data-title="Čimbenik odjeka" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target">Hrvatski</a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Faktor_dampak" title="Faktor dampak – Indonesian" lang="id" hreflang="id" data-title="Faktor dampak" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target">Bahasa Indonesia</a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Fattore_di_impatto" title="Fattore di impatto – Italian" lang="it" hreflang="it" data-title="Fattore di impatto" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target">Italiano</a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%99%D7%9E%D7%A4%D7%A7%D7%98_%D7%A4%D7%A7%D7%98%D7%95%D7%A8" title="אימפקט פקטור – Hebrew" lang="he" hreflang="he" data-title="אימפקט פקטור" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target">עברית</a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%98%D0%BC%D0%BF%D0%B0%D0%BA%D1%82-%D1%84%D0%B0%D0%BA%D1%82%D0%BE%D1%80" title="Импакт-фактор – Kazakh" lang="kk" hreflang="kk" data-title="Импакт-фактор" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target">Қазақша</a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Ietekmes_koeficients" title="Ietekmes koeficients – Latvian" lang="lv" hreflang="lv" data-title="Ietekmes koeficients" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target">Latviešu</a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Faktor_impak" title="Faktor impak – Malay" lang="ms" hreflang="ms" data-title="Faktor impak" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target">Bahasa Melayu</a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%98%D0%BC%D0%BF%D0%B0%D0%BA%D1%82_%D1%84%D0%B0%D0%BA%D1%82%D0%BE%D1%80" title="Импакт фактор – Mongolian" lang="mn" hreflang="mn" data-title="Импакт фактор" data-language-autonym="Монгол" data-language-local-name="Mongolian" class="interlanguage-link-target">Монгол</a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Impactfactor" title="Impactfactor – Dutch" lang="nl" hreflang="nl" data-title="Impactfactor" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target">Nederlands</a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%A4%E3%83%B3%E3%83%91%E3%82%AF%E3%83%88%E3%83%95%E3%82%A1%E3%82%AF%E3%82%BF%E3%83%BC" title="インパクトファクター – Japanese" lang="ja" hreflang="ja" data-title="インパクトファクター" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target">日本語</a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Impact_factor" title="Impact factor – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Impact factor" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target">Norsk bokmål</a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Impact_factor" title="Impact factor – Polish" lang="pl" hreflang="pl" data-title="Impact factor" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target">Polski</a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Fator_de_impacto" title="Fator de impacto – Portuguese" lang="pt" hreflang="pt" data-title="Fator de impacto" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target">Português</a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Factor_de_impact" title="Factor de impact – Romanian" lang="ro" hreflang="ro" data-title="Factor de impact" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target">Română</a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%98%D0%BC%D0%BF%D0%B0%D0%BA%D1%82-%D1%84%D0%B0%D0%BA%D1%82%D0%BE%D1%80" title="Импакт-фактор – Russian" lang="ru" hreflang="ru" data-title="Импакт-фактор" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target">Русский</a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Impakt_faktor" title="Impakt faktor – Slovak" lang="sk" hreflang="sk" data-title="Impakt faktor" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target">Slovenčina</a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Faktor_vpliva" title="Faktor vpliva – Slovenian" lang="sl" hreflang="sl" data-title="Faktor vpliva" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target">Slovenščina</a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Faktor_impakta" title="Faktor impakta – Serbian" lang="sr" hreflang="sr" data-title="Faktor impakta" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target">Српски / srpski</a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Vaikuttavuuskerroin" title="Vaikuttavuuskerroin – Finnish" lang="fi" hreflang="fi" data-title="Vaikuttavuuskerroin" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target">Suomi</a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/P%C3%A5verkansfaktor" title="Påverkansfaktor – Swedish" lang="sv" hreflang="sv" data-title="Påverkansfaktor" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target">Svenska</a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%A4%E0%AE%BE%E0%AE%95%E0%AF%8D%E0%AE%95_%E0%AE%95%E0%AE%BE%E0%AE%B0%E0%AE%A3%E0%AE%BF" title="தாக்க காரணி – Tamil" lang="ta" hreflang="ta" data-title="தாக்க காரணி" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target">தமிழ்</a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%9B%E0%B8%B1%E0%B8%88%E0%B8%88%E0%B8%B1%E0%B8%A2%E0%B8%81%E0%B8%A3%E0%B8%B0%E0%B8%97%E0%B8%9A" title="ปัจจัยกระทบ – Thai" lang="th" hreflang="th" data-title="ปัจจัยกระทบ" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target">ไทย</a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Etki_fakt%C3%B6r%C3%BC" title="Etki faktörü – Turkish" lang="tr" hreflang="tr" data-title="Etki faktörü" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target">Türkçe</a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B5%D1%84%D1%96%D1%86%D1%96%D1%94%D0%BD%D1%82_%D0%B2%D0%BF%D0%BB%D0%B8%D0%B2%D0%BE%D0%B2%D0%BE%D1%81%D1%82%D1%96" title="Коефіцієнт впливовості – Ukrainian" lang="uk" hreflang="uk" data-title="Коефіцієнт впливовості" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target">Українська</a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Impact_factor" title="Impact factor – Vietnamese" lang="vi" hreflang="vi" data-title="Impact factor" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target">Tiếng Việt</a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%BD%B1%E5%93%8D%E5%9B%A0%E5%AD%90" title="影响因子 – Chinese" lang="zh" hreflang="zh" data-title="影响因子" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target">中文</a></li> </ul> <div class="after-portlet after-portlet-lang"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q5330#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu 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src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Locations_of_papers_in_a_map_of_science_and_locations_of_the_key_papers_for_Nobel_prizes.tif/lossy-page1-110px-Locations_of_papers_in_a_map_of_science_and_locations_of_the_key_papers_for_Nobel_prizes.tif.jpg" decoding="async" width="110" height="67" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Locations_of_papers_in_a_map_of_science_and_locations_of_the_key_papers_for_Nobel_prizes.tif/lossy-page1-165px-Locations_of_papers_in_a_map_of_science_and_locations_of_the_key_papers_for_Nobel_prizes.tif.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Locations_of_papers_in_a_map_of_science_and_locations_of_the_key_papers_for_Nobel_prizes.tif/lossy-page1-220px-Locations_of_papers_in_a_map_of_science_and_locations_of_the_key_papers_for_Nobel_prizes.tif.jpg 2x" data-file-width="2220" data-file-height="1356" /></a></td></tr><tr><td class="sidebar-content"> <div class="hlist"> <ul><li><a href="/wiki/Altmetrics" title="Altmetrics">Altmetrics</a></li> <li><a href="/wiki/Article-level_metrics" title="Article-level metrics">Article-level</a></li> <li><a href="/wiki/Author-level_metrics" title="Author-level metrics">Author-level</a> <ul><li><a href="/wiki/Eigenfactor" title="Eigenfactor">Eigenfactor</a></li> <li><a href="/wiki/G-index" title="G-index">G-index</a></li> <li><a href="/wiki/H-index" title="H-index">H-index</a></li></ul></li> <li><a href="/wiki/Bibliographic_coupling" title="Bibliographic coupling">Bibliographic coupling</a></li> <li><a href="/wiki/Citation" title="Citation">Citation</a> <ul><li><a href="/wiki/Citation_analysis" title="Citation analysis">Analysis</a></li> <li><a href="/wiki/Citation_dynamics" title="Citation dynamics">Dynamics</a></li> <li><a href="/wiki/Citation_index" title="Citation index">Index</a></li> <li><a href="/wiki/Citation_graph" title="Citation graph">Graph</a></li></ul></li> <li><a href="/wiki/Co-citation" title="Co-citation">Co-citation</a> <ul><li><a href="/wiki/Co-citation_Proximity_Analysis" title="Co-citation Proximity Analysis">Proximity Analysis</a></li></ul></li> <li><a href="/wiki/Coercive_citation" title="Coercive citation">Coercive citation</a></li> <li><a href="/wiki/Citation_cartel" title="Citation cartel">Citation cartel</a></li> <li><a href="/wiki/Initiative_for_Open_Citations" title="Initiative for Open Citations">I4OC</a></li> <li><a href="/wiki/Journal_ranking" title="Journal ranking">Journal-level</a> <ul><li><a href="/wiki/CiteScore" title="CiteScore">CiteScore</a></li> <li><a class="mw-selflink selflink">Impact factor</a></li> <li><a href="/wiki/SCImago_Journal_Rank" title="SCImago Journal Rank">SCImago</a></li></ul></li> <li><a href="/wiki/Kardashian_Index" title="Kardashian Index">Kardashian Index</a></li></ul> </div></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Citation_metrics" title="Template:Citation metrics"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Citation_metrics" title="Template talk:Citation metrics"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Citation_metrics" title="Special:EditPage/Template:Citation metrics"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> The impact factor (IF) or journal impact factor (JIF) of an <a href="/wiki/Academic_journal" title="Academic journal">academic journal</a> is a <a href="/wiki/Scientometric" class="mw-redirect" title="Scientometric">scientometric</a> index calculated by <a href="/wiki/Clarivate" title="Clarivate">Clarivate</a> that reflects the yearly mean number of <a href="/wiki/Citation" title="Citation">citations</a> of articles published in the last two years in a given journal, as indexed by Clarivate's <a href="/wiki/Web_of_Science" title="Web of Science">Web of Science</a>. As a <a href="/wiki/Journal-level_metrics" class="mw-redirect" title="Journal-level metrics">journal-level metric</a>, it is frequently used as a <a href="/wiki/Proxy_(statistics)" title="Proxy (statistics)">proxy</a> for the relative importance of a journal within its field; journals with higher impact factor values are given the status of being more important, or carry more prestige in their respective fields, than those with lower values. While frequently used by universities and funding bodies to decide on promotion and research proposals, it has been criticised for distorting good scientific practices.<a href="#cite_note-Waltman_366-1">[1]</a><a href="#cite_note-Curry_2018-2">[2]</a><a href="#cite_note-nih2016-3">[3]</a> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=1" title="Edit section: History">edit</a>]</div> The impact factor was devised by <a href="/wiki/Eugene_Garfield" title="Eugene Garfield">Eugene Garfield</a>, the founder of the <a href="/wiki/Institute_for_Scientific_Information" title="Institute for Scientific Information">Institute for Scientific Information</a> (ISI) in Philadelphia. Impact factors began to be calculated yearly starting from 1975 for journals listed in the <a href="/wiki/Journal_Citation_Reports" title="Journal Citation Reports">Journal Citation Reports</a> (JCR). ISI was acquired by <a href="/wiki/Thomson_Scientific_%26_Healthcare" class="mw-redirect" title="Thomson Scientific & Healthcare">Thomson Scientific & Healthcare</a> in 1992,<a href="#cite_note-4">[4]</a> and became known as Thomson ISI. In 2018, <a href="/wiki/Thomson_Reuters" title="Thomson Reuters">Thomson-Reuters</a> spun off and sold ISI to <a href="/wiki/Onex_Corporation" title="Onex Corporation">Onex Corporation</a> and <a href="/wiki/Baring_Private_Equity_Asia" class="mw-redirect" title="Baring Private Equity Asia">Baring Private Equity Asia</a>.<a href="#cite_note-5">[5]</a> They founded a new corporation, Clarivate, which is now the publisher of the JCR.<a href="#cite_note-6">[6]</a> <div class="mw-heading mw-heading2"><h2 id="Calculation">Calculation</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=2" title="Edit section: Calculation">edit</a>]</div> In any given year, the two-year journal impact factor is the ratio between the number of citations received in that year for publications in that journal that were published in the two preceding years and the total number of "citable items" published in that journal during the two preceding years:<a href="#cite_note-Web_of_Science_Group_2019-7">[7]</a><a href="#cite_note-garfield-8">[8]</a> <math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\text{IF}}_{y}={\frac {{\text{Citations}}_{y}}{{\text{Publications}}_{y-1}+{\text{Publications}}_{y-2}}}.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mrow class="MJX-TeXAtom-ORD"> <mtext>IF</mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>y</mi> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msub> <mrow class="MJX-TeXAtom-ORD"> <mtext>Citations</mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>y</mi> </mrow> </msub> <mrow> <msub> <mrow class="MJX-TeXAtom-ORD"> <mtext>Publications</mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>y</mi> <mo>−</mo> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mrow class="MJX-TeXAtom-ORD"> <mtext>Publications</mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>y</mi> <mo>−</mo> <mn>2</mn> </mrow> </msub> </mrow> </mfrac> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\text{IF}}_{y}={\frac {{\text{Citations}}_{y}}{{\text{Publications}}_{y-1}+{\text{Publications}}_{y-2}}}.}</annotation> </semantics> </math><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/bbce39b9338f67d5e619e5a928680658bced1e4d" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:42.287ex; height:6.509ex;" alt="{\displaystyle {\text{IF}}_{y}={\frac {{\text{Citations}}_{y}}{{\text{Publications}}_{y-1}+{\text{Publications}}_{y-2}}}.}"> For example, <a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a> had an impact factor of 41.577 in 2017:<a href="#cite_note-WoS-9">[9]</a> <math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\text{IF}}_{2017}={\frac {{\text{Citations}}_{2017}}{{\text{Publications}}_{2016}+{\text{Publications}}_{2015}}}={\frac {74090}{880+902}}=41.577.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mrow class="MJX-TeXAtom-ORD"> <mtext>IF</mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2017</mn> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msub> <mrow class="MJX-TeXAtom-ORD"> <mtext>Citations</mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2017</mn> </mrow> </msub> <mrow> <msub> <mrow class="MJX-TeXAtom-ORD"> <mtext>Publications</mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2016</mn> </mrow> </msub> <mo>+</mo> <msub> <mrow class="MJX-TeXAtom-ORD"> <mtext>Publications</mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2015</mn> </mrow> </msub> </mrow> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>74090</mn> <mrow> <mn>880</mn> <mo>+</mo> <mn>902</mn> </mrow> </mfrac> </mrow> <mo>=</mo> <mn>41.577.</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\text{IF}}_{2017}={\frac {{\text{Citations}}_{2017}}{{\text{Publications}}_{2016}+{\text{Publications}}_{2015}}}={\frac {74090}{880+902}}=41.577.}</annotation> </semantics> </math><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/6339c8ba2a4c7d3a165d18b577232c24b2e7d4dc" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:68.805ex; height:5.843ex;" alt="{\displaystyle {\text{IF}}_{2017}={\frac {{\text{Citations}}_{2017}}{{\text{Publications}}_{2016}+{\text{Publications}}_{2015}}}={\frac {74090}{880+902}}=41.577.}"> This means that, on average, its papers published in 2015 and 2016 received roughly 42 citations each in 2017. 2017 impact factors are reported in 2018; they cannot be calculated until all of the 2017 publications have been processed by the indexing agency. The value of impact factor depends on how to define "citations" and "publications"; the latter are often referred to as "citable items". In current practice, both "citations" and "publications" are defined exclusively by ISI as follows. "Publications" are items that are classed as "article", "review" or "proceedings paper"<a href="#cite_note-McVeighMann2009-10">[10]</a> in the Web of Science (WoS) database; other items like editorials, corrections, notes, retractions and discussions are excluded. WoS is accessible to all registered users, who can independently verify the number of citable items for a given journal. In contrast, the number of citations is extracted not from the WoS database, but from a dedicated JCR database, which is not accessible to general readers. Hence, the commonly used "JCR Impact Factor" is a proprietary value, which is defined and calculated by ISI and can not be verified by external users.<a href="#cite_note-11">[11]</a> New journals, which are indexed from their first published issue, will receive an impact factor after two years of indexing; in this case, the citations to the year prior to volume 1, and the number of articles published in the year prior to volume 1, are known zero values. Journals that are indexed starting with a volume other than the first volume will not get an impact factor until they have been indexed for three years. Occasionally, Journal Citation Reports assigns an impact factor to new journals with less than two years of indexing, based on partial citation data.<a href="#cite_note-12">[12]</a><a href="#cite_note-13">[13]</a> The calculation always uses two complete and known years of item counts, but for new titles one of the known counts is zero. Annuals and other irregular publications sometimes publish no items in a particular year, affecting the count. The impact factor relates to a specific time period; it is possible to calculate it for any desired period. For example, the JCR also includes a five-year impact factor, which is calculated by dividing the number of citations to the journal in a given year by the number of articles published in that journal in the previous five years.<a href="#cite_note-newJCR-14">[14]</a><a href="#cite_note-15">[15]</a> <div class="mw-heading mw-heading2"><h2 id="Use">Use</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=3" title="Edit section: Use">edit</a>]</div> While originally invented as a tool to help university librarians to decide which journals to purchase, the impact factor soon became used as a measure for judging academic success. This use of impact factors was summarised by Hoeffel in 1998:<a href="#cite_note-:1-16">[16]</a> <blockquote>Impact Factor is not a perfect tool to measure the quality of articles but there is nothing better and it has the advantage of already being in existence and is, therefore, a good technique for scientific evaluation. Experience has shown that in each specialty the best journals are those in which it is most difficult to have an article accepted, and these are the journals that have a high impact factor. Most of these journals existed long before the impact factor was devised. The use of impact factor as a measure of quality is widespread because it fits well with the opinion we have in each field of the best journals in our specialty....In conclusion, prestigious journals publish papers of high level. Therefore, their impact factor is high, and not the contrary.</blockquote> As impact factors are a journal-level metric, rather than an article- or individual-level metric, this use is controversial. Eugene Garfield, the inventor of the JIF agreed with Hoeffel,<a href="#cite_note-17">[17]</a> but warned about the "misuse in evaluating individuals" because there is "a wide variation [of citations] from article to article within a single journal".<a href="#cite_note-garfield98-18">[18]</a> Despite this warning, the use of the JIF has evolved, playing a key role in the process of assessing individual researchers, their job applications and their funding proposals. In 2005, The Journal of Cell Biology noted that: <blockquote>Impact factor data ... have a strong influence on the scientific community, affecting decisions on where to publish, whom to promote or hire, the success of grant applications, and even salary bonuses.<a href="#cite_note-Rossner_2007-19">[19]</a></blockquote> More targeted research has begun to provide firm evidence of how deeply the impact factor is embedded within formal and informal research assessment processes. A review in 2019 studied how often the JIF featured in documents related to the review, promotion, and tenure of scientists in US and Canadian universities. It concluded that 40% of universities focused on academic research specifically mentioned the JIF as part of such review, promotion, and tenure processes.<a href="#cite_note-20">[20]</a> And a 2017 study of how researchers in the life sciences behave concluded that "everyday decision-making practices as highly governed by pressures to publish in high-impact journals". The deeply embedded nature of such indicators not only effect research assessment, but the more fundamental issue of what research is actually undertaken: "Given the current ways of evaluation and valuing research, risky, lengthy, and unorthodox project rarely take center stage."<a href="#cite_note-:0-21">[21]</a> <div class="mw-heading mw-heading2"><h2 id="Criticism">Criticism</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=4" title="Edit section: Criticism">edit</a>]</div> Numerous critiques have been made regarding the use of impact factors, both in terms of its statistical validity and also of its implications for how science is carried out and assessed.<a href="#cite_note-nih2016-3">[3]</a><a href="#cite_note-22">[22]</a><a href="#cite_note-EASE-23">[23]</a><a href="#cite_note-Beat_it,_impact_factor!_Publishing-24">[24]</a><a href="#cite_note-Brembs_2013-25">[25]</a> A 2007 study noted that the most fundamental flaw is that impact factors present the <a href="/wiki/Arithmetic_mean" title="Arithmetic mean">mean</a> of data that are not <a href="/wiki/Normal_distribution" title="Normal distribution">normally distributed</a>, and suggested that it would be more appropriate to present the <a href="/wiki/Median" title="Median">median</a> of these data.<a href="#cite_note-Rossner_2007-19">[19]</a> There is also a more general debate on the validity of the impact factor as a measure of journal importance and the effect of policies that editors may adopt to boost their impact factor (perhaps to the detriment of readers and writers). Other criticism focuses on the effect of the impact factor on behavior of scholars, editors and other stakeholders<a href="#cite_note-26">[26]</a>. Criticism of impact factors also extends to its impact on researcher behavior. While the emphasis on high-impact journals may lead to strategic publishing practices that prioritize journal prestige over the quality and relevance of research, it's important to acknowledge the "privilege paradox" <a href="#cite_note-:3-27">[27]</a>. Younger researchers, particularly those from under-represented regions, often lack the established reputation or networks to secure recognition outside of these metrics<a href="#cite_note-:3-27">[27]</a>. This can lead to a narrow focus on publishing in top-tier journals, potentially compromising the diversity of research topics and methodologies. Further criticisms argue that emphasis on impact factor results from the negative influence of <a href="/wiki/Neoliberal" class="mw-redirect" title="Neoliberal">neoliberal</a> politics on academia. Some of these arguments demand not just replacement of the impact factor with more sophisticated metrics but also discussion on the social value of research assessment and the growing precariousness of scientific careers in higher education.<a href="#cite_note-28">[28]</a><a href="#cite_note-Cabello-29">[29]</a> <div class="mw-heading mw-heading3"><h3 id="Inapplicability_of_impact_factor_to_individuals_and_between-discipline_differences">Inapplicability of impact factor to individuals and between-discipline differences</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=5" title="Edit section: Inapplicability of impact factor to individuals and between-discipline differences">edit</a>]</div> It has been stated that impact factors in particular and citation analysis in general are affected by field-dependent factors<a href="#cite_note-30">[30]</a> which invalidate comparisons not only across disciplines but even within different fields of research of one discipline.<a href="#cite_note-31">[31]</a> The percentage of total citations occurring in the first two years after publication also varies highly among disciplines from 1–3% in the mathematical and physical sciences to 5–8% in the biological sciences.<a href="#cite_note-32">[32]</a> Thus impact factors cannot be used to compare journals across disciplines. Impact factors are sometimes used to evaluate not only the journals but the papers therein, thereby devaluing papers in certain subjects.<a href="#cite_note-33">[33]</a> In 2004, the <a href="/wiki/Higher_Education_Funding_Council_for_England" title="Higher Education Funding Council for England">Higher Education Funding Council for England</a> was urged by the <a href="/wiki/House_of_Commons_of_the_United_Kingdom" title="House of Commons of the United Kingdom">House of Commons</a> <a href="/wiki/Science_and_Technology_Select_Committee" class="mw-redirect" title="Science and Technology Select Committee">Science and Technology Select Committee</a> to remind <a href="/wiki/Research_Assessment_Exercise" title="Research Assessment Exercise">Research Assessment Exercise</a> panels that they are obliged to assess the quality of the content of individual articles, not the reputation of the journal in which they are published.<a href="#cite_note-34">[34]</a> Other studies have repeatedly stated that impact factor is a metric for journals and should not be used to assess individual researchers or institutions.<a href="#cite_note-Seglen-BMJ-35">[35]</a><a href="#cite_note-36">[36]</a><a href="#cite_note-37">[37]</a> <div class="mw-heading mw-heading3"><h3 id="Questionable_editorial_policies_that_affect_the_impact_factor">Questionable editorial policies that affect the impact factor</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=6" title="Edit section: Questionable editorial policies that affect the impact factor">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Conflicts_of_interest_in_academic_publishing#COIs_of_journals" title="Conflicts of interest in academic publishing">Conflicts of interest in academic publishing § COIs of journals</a></div> Because impact factor is commonly accepted as a proxy for research quality, some journals adopt editorial policies and practices, some acceptable and some of dubious purpose, to increase its impact factor.<a href="#cite_note-38">[38]</a><a href="#cite_note-39">[39]</a> For example, journals may publish a larger percentage of <a href="/wiki/Review_article" title="Review article">review articles</a> which generally are cited more than research reports.<a href="#cite_note-garfield-8">[8]</a> Research undertaken in 2020 on dentistry journals concluded that the publication of "systematic reviews have significant effect on the Journal Impact Factor ... while papers publishing clinical trials bear no influence on this factor. Greater yearly average of published papers ... means a higher impact factor."<a href="#cite_note-40">[40]</a> Journals may also attempt to limit the number of "citable items"—i.e., the denominator of the impact factor equation—either by declining to publish articles that are unlikely to be cited (such as case reports in medical journals) or by altering articles (e.g., by not allowing an <a href="/wiki/Abstract_(summary)" title="Abstract (summary)">abstract</a> or <a href="/wiki/Bibliography" title="Bibliography">bibliography</a> in hopes that Journal Citation Reports will not deem it a "citable item"). As a result of negotiations over whether items are "citable", impact factor variations of more than 300% have been observed.<a href="#cite_note-PLoS-editorial-41">[41]</a> Items considered to be uncitable—and thus are not incorporated in impact factor calculations—can, if cited, still enter into the numerator part of the equation despite the ease with which such citations could be excluded. This effect is hard to evaluate, for the distinction between editorial comment and short original articles is not always obvious. For example, letters to the editor may be part of either class. Another less insidious tactic journals employ is to publish a large portion of its papers, or at least the papers expected to be highly cited, early in the calendar year. This gives those papers more time to gather citations. Several methods, not necessarily with nefarious intent, exist for a journal to cite articles in the same journal which will increase the journal's impact factor.<a href="#cite_note-42">[42]</a><a href="#cite_note-pmid12139549-43">[43]</a> Beyond editorial policies that may skew the impact factor, journals can take overt steps to <a href="/wiki/Game_the_system" class="mw-redirect" title="Game the system">game the system</a>. For example, in 2007, the specialist journal <a href="/wiki/Folia_Phoniatrica_et_Logopaedica" class="mw-redirect" title="Folia Phoniatrica et Logopaedica">Folia Phoniatrica et Logopaedica</a>, with an impact factor of 0.66, published an editorial that cited all its articles from 2005 to 2006 in a protest against the "absurd scientific situation in some countries" related to use of the impact factor.<a href="#cite_note-44">[44]</a> The large number of citations meant that the impact factor for that journal increased to 1.44. As a result of the increase, the journal was not included in the 2008 and 2009 Journal Citation Reports.<a href="#cite_note-45">[45]</a> <a href="/wiki/Coercive_citation" title="Coercive citation">Coercive citation</a> is a practice in which an editor forces an author to add extraneous citations to an article before the journal will agree to publish it, in order to inflate the journal's impact factor.<a href="#cite_note-46">[46]</a> A survey published in 2012 indicates that coercive citation has been experienced by one in five researchers working in economics, sociology, psychology, and multiple business disciplines, and it is more common in business and in journals with a lower impact factor.<a href="#cite_note-47">[47]</a> Editors of leading business journals banded together to disavow the practice.<a href="#cite_note-48">[48]</a> However, cases of coercive citation have occasionally been reported for other disciplines.<a href="#cite_note-49">[49]</a> <div class="mw-heading mw-heading3"><h3 id="Assumed_correlation_between_impact_factor_and_quality">Assumed correlation between impact factor and quality</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=7" title="Edit section: Assumed correlation between impact factor and quality">edit</a>]</div> The journal impact factor was originally designed by Eugene Garfield as a metric to help librarians make decisions about which journals were worth indexing, as the JIF aggregates the number of citations to articles published in each journal. Since then, the JIF has become associated as a mark of journal "quality", and gained widespread use for evaluation of research and researchers instead, even at the institutional level. It thus has significant impact on steering research practices and behaviours.<a href="#cite_note-Lariviere_2018-50">[50]</a><a href="#cite_note-Curry_2018-2">[2]</a><a href="#cite_note-51">[51]</a> By 2010, national and international research funding institutions were already starting to point out that numerical indicators such as the JIF should not be considered as a measure of quality.<a href="#cite_note-52">[note 1]</a> In fact, research was indicating that the JIF is a highly manipulated metric,<a href="#cite_note-Falagas_2008-53">[52]</a><a href="#cite_note-Tort_2012-54">[53]</a><a href="#cite_note-Fong_2017-55">[54]</a> and the justification for its continued widespread use beyond its original narrow purpose seems due to its simplicity (easily calculable and comparable number), rather than any actual relationship to research quality.<a href="#cite_note-Adler_2008-56">[55]</a><a href="#cite_note-Brembs_2018-57">[56]</a><a href="#cite_note-Lariviere_2009-58">[57]</a> Empirical evidence shows that the misuse of the JIF—and journal ranking metrics in general—has a number of negative consequences for the scholarly communication system. These include gaps between the reach of a journal and the quality of its individual papers<a href="#cite_note-Brembs_2013-25">[25]</a> and insufficient coverage of social sciences and humanities as well as research outputs from across Latin America, Africa, and South-East Asia.<a href="#cite_note-59">[58]</a> Additional drawbacks include the marginalization of research in <a href="/wiki/Vernacular_language" class="mw-redirect" title="Vernacular language">vernacular languages</a> and on locally relevant topics and inducement to unethical authorship and citation practices. More generally, the impact factors fosters a reputation economy, where scientific success is based on publishing in prestigious journals ahead of actual research qualities such as rigorous methods, replicability and social impact. Using journal prestige and the JIF to cultivate a competition regime in academia has been shown to have deleterious effects on research quality.<a href="#cite_note-Vessuri_2014-60">[59]</a> A number of regional and international initiatives are now providing and suggesting alternative research assessment systems, including key documents such as the <a href="/wiki/Leiden_Manifesto" title="Leiden Manifesto">Leiden Manifesto</a><a href="#cite_note-61">[note 2]</a> and the <a href="/wiki/San_Francisco_Declaration_on_Research_Assessment" title="San Francisco Declaration on Research Assessment">San Francisco Declaration on Research Assessment</a> (DORA). <a href="/wiki/Plan_S" title="Plan S">Plan S</a> calls for a broader adoption and implementation of such initiatives alongside fundamental changes in the scholarly communication system.<a href="#cite_note-62">[note 3]</a> As appropriate measures of quality for authors and research, concepts of research excellence should be remodelled around transparent workflows and accessible research results.<a href="#cite_note-Moore_2017-63">[60]</a><a href="#cite_note-Owen_2012-64">[61]</a><a href="#cite_note-Hicks_2015-65">[62]</a> JIFs are still regularly used to evaluate research in many countries, which is a problem since a number of issues remain around the opacity of the metric and the fact that it is often negotiated by publishers.<a href="#cite_note-Guédon_2008-66">[63]</a><a href="#cite_note-Alperin_2018-67">[64]</a><a href="#cite_note-Rossner_2007-19">[19]</a> <div class="mw-heading mw-heading3"><h3 id="Negotiated_values">Negotiated values</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=8" title="Edit section: Negotiated values">edit</a>]</div> Results of an impact factor can change dramatically depending on which items are considered as "citable" and therefore included in the denominator.<a href="#cite_note-68">[65]</a> One notorious example of this occurred in 1988 when it was decided that meeting abstracts published in FASEB Journal would no longer be included in the denominator. The journal's impact factor jumped from 0.24 in 1988 to 18.3 in 1989.<a href="#cite_note-69">[66]</a> Publishers routinely discuss with Clarivate how to improve the "accuracy" of their journals' impact factor and therefore get higher scores.<a href="#cite_note-PLoS-editorial-41">[41]</a><a href="#cite_note-Brembs_2013-25">[25]</a> Such discussions routinely produce "negotiated values" which result in dramatic changes in the observed scores for dozens of journals, sometimes after unrelated events like the purchase by one of the larger publishers.<a href="#cite_note-70">[67]</a> <div class="mw-heading mw-heading3"><h3 id="Distribution_skewness">Distribution skewness</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=9" title="Edit section: Distribution skewness">edit</a>]</div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Journal_impact_factor_Nature_Plos_One.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Journal_impact_factor_Nature_Plos_One.png/440px-Journal_impact_factor_Nature_Plos_One.png" decoding="async" width="440" height="224" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/7/7e/Journal_impact_factor_Nature_Plos_One.png 1.5x" data-file-width="632" data-file-height="322" /></a><figcaption>Journal impact factors are influenced heavily by a small number of highly cited papers. Most papers published in 2013–14 received many fewer citations than indicated by the impact factor. Two journals (<a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a> [blue] and <a href="/wiki/PLOS_One" title="PLOS One">PLOS ONE</a> [orange]) are shown to represent a highly cited and less cited journal, respectively. The high citation impact of Nature is derived from relatively few highly cited papers. Modified after Callaway 2016.<a href="#cite_note-Callaway_2016-71">[68]</a></figcaption></figure> Because citation counts have highly <a href="/wiki/Skewed_distribution" class="mw-redirect" title="Skewed distribution">skewed distributions</a>,<a href="#cite_note-Beat_it,_impact_factor!_Publishing-24">[24]</a> the mean number of citations is potentially misleading if used to gauge the typical impact of articles in the journal rather than the overall impact of the journal itself.<a href="#cite_note-72">[69]</a> For example, about 90% of <a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a>'s 2004 impact factor was based on only a quarter of its publications. Thus the actual number of citations for a single article in the journal is in most cases much lower than the mean number of citations across articles.<a href="#cite_note-73">[70]</a> Furthermore, the strength of the relationship between impact factors of journals and the citation rates of the papers therein has been steadily decreasing since articles began to be available digitally.<a href="#cite_note-74">[71]</a> The effect of outliers can be seen in the case of the article "A short history of SHELX", which included this sentence: "This paper could serve as a general literature citation when one or more of the open-source SHELX programs (and the Bruker AXS version SHELXTL) are employed in the course of a crystal-structure determination". This article received more than 6,600 citations. As a consequence, the impact factor of the journal <a href="/wiki/Acta_Crystallographica" title="Acta Crystallographica">Acta Crystallographica</a> Section A rose from 2.051 in 2008 to 49.926 in 2009, more than <a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a> (at 31.434) and <a href="/wiki/Science_(journal)" title="Science (journal)">Science</a> (at 28.103).<a href="#cite_note-75">[72]</a> The second-most cited article in Acta Crystallographica Section A in 2008 had only 28 citations.<a href="#cite_note-76">[73]</a> Critics of the JIF state that use of the <a href="/wiki/Arithmetic_mean" title="Arithmetic mean">arithmetic mean</a> in its calculation is problematic because the pattern of citation distribution is skewed<a href="#cite_note-Lariviere_2016-77">[74]</a> and citation distributions metrics have been proposed as an alternative to impact factors.<a href="#cite_note-78">[75]</a><a href="#cite_note-79">[76]</a><a href="#cite_note-80">[77]</a> However, there have also been pleas to take a more nuanced approach to judging the distribution skewness of the impact factor. Ludo Waltman and Vincent Antonio Traag, in their 2021 paper, ran numerous simulations and concluded that "statistical objections against the use of the IF at the level of individual articles are not convincing", and that "the IF may be a more accurate indicator of the value of an article than the number of citations of the article".<a href="#cite_note-Waltman_366-1">[1]</a> <div class="mw-heading mw-heading3"><h3 id="Reproducibility">Reproducibility</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=10" title="Edit section: Reproducibility">edit</a>]</div> While the underlying mathematical model is publicly known, the dataset which is used to calculate the JIF is not publicly available. This prompted criticism: "Just as scientists would not accept the findings in a scientific paper without seeing the primary data, so should they not rely on Thomson Scientific's impact factor, which is based on hidden data".<a href="#cite_note-Rossner_2007-19">[19]</a> However, a 2019 article demonstrated that "with access to the data and careful cleaning, the JIF can be reproduced", although this required much labour to achieve.<a href="#cite_note-:2-81">[78]</a> A 2020 research paper went further. It indicated that by querying open access or partly open-access databases, like Google Scholar, ResearchGate, and Scopus, it is possible to calculate approximate impact factors without the need to purchase Web of Science / JCR.<a href="#cite_note-82">[79]</a> <div class="mw-heading mw-heading3"><h3 id="Broader_negative_impact_on_science">Broader negative impact on science</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=11" title="Edit section: Broader negative impact on science">edit</a>]</div> Just as the impact factor has attracted criticism for various immediate problems associated with its application, so has there also been criticism that its application undermines the broader process of science. Research has indicated that bibliometrics figures, particularly the impact factor, decrease the quality of peer review an article receives,<a href="#cite_note-83">[80]</a> cause a reluctance to share data,<a href="#cite_note-:0-21">[21]</a> decrease the quality of articles,<a href="#cite_note-84">[81]</a> and a reduce the scope in of publishable research. "For many researchers the only research questions and projects that appear viable are those that can meet the demand of scoring well in terms of metric performance indicators – and chiefly the journal impact factor.".<a href="#cite_note-:0-21">[21]</a> Furthermore, the process of publication and science is slowed down – authors automatically try and publish with the journals with the highest impact factor – "as editors and reviewers are tasked with reviewing papers that are not submitted to the most appropriate venues".<a href="#cite_note-:2-81">[78]</a> <div class="mw-heading mw-heading2"><h2 id="Institutional_responses_to_criticism_of_the_impact_factor">Institutional responses to criticism of the impact factor</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=12" title="Edit section: Institutional responses to criticism of the impact factor">edit</a>]</div> Given the growing criticism and its widespread usage as a means of research assessment, organisations and institutions have begun to take steps to move away from the journal impact factor. In November 2007 the <a href="/wiki/European_Association_of_Science_Editors" title="European Association of Science Editors">European Association of Science Editors</a> (EASE) issued an official statement recommending "that journal impact factors are used only—and cautiously—for measuring and comparing the influence of entire journals, but not for the assessment of single papers, and certainly not for the assessment of researchers or research programmes".<a href="#cite_note-EASE-23">[23]</a> In July 2008, the <a href="/wiki/International_Council_for_Science" title="International Council for Science">International Council for Science</a> Committee on Freedom and Responsibility in the Conduct of Science issued a "statement on publication practices and indices and the role of <a href="/wiki/Peer_review" title="Peer review">peer review</a> in research assessment", suggesting many possible solutions—e.g., considering a limit number of publications per year to be taken into consideration for each scientist, or even penalising scientists for an excessive number of publications per year—e.g., more than 20.<a href="#cite_note-test-85">[82]</a> In February 2010, the <a href="/wiki/Deutsche_Forschungsgemeinschaft" class="mw-redirect" title="Deutsche Forschungsgemeinschaft">Deutsche Forschungsgemeinschaft</a> (German Research Foundation) published new guidelines to reduce the number of publications that could be submitted when applying for funding: "The focus has not been on what research someone has done but rather how many papers have been published and where." They noted that for decisions concerning "performance-based funding allocations, postdoctoral qualifications, appointments, or reviewing funding proposals, [where] increasing importance has been given to numerical indicators such as the <a href="/wiki/H-index" title="H-index">h-index</a> and the impact factor".<a href="#cite_note-86">[83]</a> The UK's <a href="/wiki/Research_Assessment_Exercise" title="Research Assessment Exercise">Research Assessment Exercise</a> for 2014 also banned the journal impact factor<a href="#cite_note-87">[84]</a> although evidence suggested that this ban was often ignored.<a href="#cite_note-88">[85]</a> In response to growing concerns over the inappropriate use of journal impact factors in evaluating scientific outputs and scientists themselves, the <a href="/wiki/American_society_for_cell_biology" class="mw-redirect" title="American society for cell biology">American Society for Cell Biology</a> together with a group of editors and publishers of scholarly journals created the <a href="/wiki/San_Francisco_Declaration_on_Research_Assessment" title="San Francisco Declaration on Research Assessment">San Francisco Declaration on Research Assessment</a> (DORA). Released in May 2013, DORA has garnered support from thousands of individuals and hundreds of institutions,<a href="#cite_note-Cabello-29">[29]</a> including in March 2015 the League of European Research Universities (a consortium of 21 of the most renowned research universities in Europe),<a href="#cite_note-89">[86]</a> who have endorsed the document on the DORA website. Publishers, even those with high impact factors, also recognised the flaws.<a href="#cite_note-90">[87]</a> Nature magazine criticised the over-reliance on JIF, pointing not just to its statistical flaws but to negative effects on science: "The resulting pressures and disappointments are nothing but demoralizing, and in badly run labs can encourage sloppy research that, for example, fails to test assumptions thoroughly or to take all the data into account before submitting big claims."<a href="#cite_note-91">[88]</a> Various publishers now use a mixture of metrics on their website; the PLOS series of journals does not display the impact factor.<a href="#cite_note-92">[89]</a> Microsoft Academic took a similar view, stating that h-index, EI/SCI and journal impact factors are not shown because "the research literature has provided abundant evidence that these metrics are at best a rough approximation of research impact and scholarly influence."<a href="#cite_note-93">[90]</a> In 2021, <a href="/wiki/Utrecht_University" title="Utrecht University">Utrecht University</a> promised to abandon all quantitative bibliometrics, including the impact factor. The university stated that "it has become a very sick model that goes beyond what is really relevant for science and putting science forward".<a href="#cite_note-94">[91]</a><a href="#cite_note-95">[92]</a> This followed a 2018 decision by the main Dutch funding body for research, <a href="/wiki/Dutch_Research_Council" title="Dutch Research Council">NWO</a>, to remove all references to journal impact factors and the h-index in all call texts and application forms.<a href="#cite_note-96">[93]</a> Utrecht's decision met with some resistance. An open letter signed by over 150 Dutch academics argued that, while imperfect, the JIF is still useful, and that omitting it "will lead to randomness and a compromising of scientific quality".<a href="#cite_note-97">[94]</a> <div class="mw-heading mw-heading2"><h2 id="Related_indices">Related indices</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=13" title="Edit section: Related indices">edit</a>]</div> Some related metrics, also calculated and published by the same organization, include: <ul><li>Cited half-life: the median age of the articles that were cited in Journal Citation Reports each year. For example, if a journal's half-life in 2005 is 5, that means the citations from 2001 to 2005 are half of all the citations from that journal in 2005, and the other half of the citations precede 2001.<a href="#cite_note-98">[95]</a></li> <li>Aggregate impact factor for a subject category: it is calculated taking into account the number of citations to all journals in the subject category and the number of articles from all the journals in the subject category.</li> <li>Immediacy index: the number of citations the articles in a journal receive in a given year divided by the number of articles published.</li> <li> Journal citation indicator (JCI): a JIF that adjusts for scientific field; it is similar to <a href="/wiki/Source_Normalized_Impact_per_Paper" class="mw-redirect" title="Source Normalized Impact per Paper">Source Normalized Impact per Paper</a>, calculated based on the <a href="/wiki/Scopus" title="Scopus">Scopus</a> database.<a href="#cite_note-Science2021-99">[96]</a> JCI is available for all journals in the <a href="/wiki/Web_of_Science_Core_Collection" class="mw-redirect" title="Web of Science Core Collection">Web of Science Core Collection</a> (WoS CC) -- including the AHCI, ESCI, BCI, CPCI—while JIF is only available for the SCIE and SSCI; however, starting in June 2023, JIF will also be issued for all journals in the WoS CC.<a href="#cite_note-Clarivate_2022-100">[97]</a></li> <li>JIF quartile ranking: a rank based on the four <a href="/wiki/Quartile" title="Quartile">quartiles</a> within a given subject or topic category.<a href="#cite_note-101">[98]</a></li> <li>JIF percentile ranking: a <a href="/wiki/Percentile_rank" title="Percentile rank">percentile rank</a> computed for a particular subject category.<a href="#cite_note-jcr.help.clarivate.com-102">[99]</a></li></ul> A given journal may attain a different quartile or percentile in different categories. As with the impact factor, there are some nuances to this: for example, Clarivate excludes certain article types (such as news items, correspondence, and errata) from the denominator.<a href="#cite_note-Elsevier-103">[100]</a><a href="#cite_note-thomson-104">[101]</a><a href="#cite_note-JCR-ii-105">[102]</a><a href="#cite_note-McVeighMann2009-10">[10]</a> <div class="mw-heading mw-heading3"><h3 id="Other_measures_of_scientific_impact">Other measures of scientific impact</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=14" title="Edit section: Other measures of scientific impact">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Citation_metrics" class="mw-redirect" title="Citation metrics">Citation metrics</a></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Scientometrics" title="Scientometrics">Scientometrics</a></div> Additional <a href="/wiki/Journal-level_metrics" class="mw-redirect" title="Journal-level metrics">journal-level metrics</a> are available from other organizations. For example, <a href="/wiki/CiteScore" title="CiteScore">CiteScore</a> is a metric for serial titles in <a href="/wiki/Scopus" title="Scopus">Scopus</a> launched in December 2016 by <a href="/wiki/Elsevier" title="Elsevier">Elsevier</a>.<a href="#cite_note-106">[103]</a><a href="#cite_note-107">[104]</a> While these metrics apply only to journals, there are also <a href="/wiki/Author-level_metrics" title="Author-level metrics">author-level metrics</a>, such as the <a href="/wiki/H-index" title="H-index">h-index</a>, that apply to individual researchers. In addition, <a href="/wiki/Article-level_metrics" title="Article-level metrics">article-level metrics</a> measure impact at an article level instead of journal level. Other more general alternative metrics, or "<a href="/wiki/Altmetrics" title="Altmetrics">altmetrics</a>", that include article views, downloads, or mentions in <a href="/wiki/Social_media" title="Social media">social media</a>, offer a different perspective on research impact, concentrating more on immediate social impact in and outside academia.<a href="#cite_note-Hicks_2015-65">[62]</a><a href="#cite_note-Priem_2010-108">[105]</a> <div class="mw-heading mw-heading3"><h3 id="Counterfeit_impact_factors">Counterfeit impact factors</h3>[<a href="/w/index.php?title=Impact_factor&action=edit&section=15" title="Edit section: Counterfeit impact factors">edit</a>]</div> Fake impact factors or bogus impact factors are produced by certain companies or individuals.<a href="#cite_note-fake-109">[106]</a> According to an article published in the Electronic Physician, these include Global Impact Factor, Citefactor, and Universal Impact Factor.<a href="#cite_note-fake-109">[106]</a> <a href="/wiki/Jeffrey_Beall" title="Jeffrey Beall">Jeffrey Beall</a> maintained a list of such misleading metrics.<a href="#cite_note-110">[107]</a><a href="#cite_note-111">[108]</a> Another deceitful practice is reporting "alternative impact factors", calculated as the average number of citations per article using <a href="/wiki/Citation_indices" class="mw-redirect" title="Citation indices">citation indices</a> other than JCR such as <a href="/wiki/Google_Scholar" title="Google Scholar">Google Scholar</a> (e.g., "Google-based Journal Impact Factor") or <a href="/wiki/Microsoft_Academic" title="Microsoft Academic">Microsoft Academic</a>.<a href="#cite_note-XiaSmith2018-112">[109]</a> False impact factors are often used by <a href="/wiki/Predatory_publishers" class="mw-redirect" title="Predatory publishers">predatory publishers</a>.<a href="#cite_note-113">[110]</a><a href="#cite_note-114">[111]</a> Consulting Journal Citation Reports' master journal list can confirm if a publication is <a href="/wiki/Journal_indexing" class="mw-redirect" title="Journal indexing">indexed</a> by the Journal Citation Reports.<a href="#cite_note-115">[112]</a> The use of fake impact metrics is considered a <a href="/wiki/Red_flag_(idiom)" title="Red flag (idiom)">red flag</a>.<a href="#cite_note-116">[113]</a> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=16" title="Edit section: See also">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .portalbox-entry{display:table-row;font-size:85%;line-height:110%;height:1.9em;font-style:italic;font-weight:bold}.mw-parser-output .portalbox-image{display:table-cell;padding:0.2em;vertical-align:middle;text-align:center}.mw-parser-output .portalbox-link{display:table-cell;padding:0.2em 0.2em 0.2em 0.3em;vertical-align:middle}@media(min-width:720px){.mw-parser-output .portalleft{clear:left;float:left;margin:0.5em 1em 0.5em 0}.mw-parser-output .portalright{clear:right;float:right;margin:0.5em 0 0.5em 1em}}</style><ul role="navigation" aria-label="Portals" class="noprint portalbox portalborder portalright"> <li class="portalbox-entry"><a href="/wiki/File:Nuvola_apps_kalzium.svg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8b/Nuvola_apps_kalzium.svg/28px-Nuvola_apps_kalzium.svg.png" decoding="async" width="28" height="28" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8b/Nuvola_apps_kalzium.svg/42px-Nuvola_apps_kalzium.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8b/Nuvola_apps_kalzium.svg/56px-Nuvola_apps_kalzium.svg.png 2x" data-file-width="128" data-file-height="128" /></a><a href="/wiki/Portal:Science" title="Portal:Science">Science portal</a></li></ul> <ul><li><a href="/wiki/Author-level_metrics#Author_Impact_Factor" title="Author-level metrics">Author impact factor</a></li> <li><a href="/wiki/Citation_impact" title="Citation impact">Citation impact</a></li> <li><a href="/wiki/Goodhart%27s_law" title="Goodhart's law">Goodhart's law</a></li> <li><a href="/wiki/Journalology" title="Journalology">Journalology</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes_on_alternatives">Notes on alternatives</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=17" title="Edit section: Notes on alternatives">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output 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The Archives of Bone and Joint Surgery. 4 (2): 94–6. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4852052">4852052</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/27200383">27200383</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Archives+of+Bone+and+Joint+Surgery&rft.atitle=Validated+Measures+of+Publication+Quality%3A+Guide+for+Novice+Researchers+to+Choose+an+Appropriate+Journal+for+Paper+Submission&rft.volume=4&rft.issue=2&rft.pages=94-6&rft.date=2016-04&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC4852052%23id-name%3DPMC&rft_id=info%3Apmid%2F27200383&rft.aulast=Ebrahimzadeh&rft.aufirst=MH&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC4852052&rfr_id=info%3Asid%2Fen.wikipedia.org%3AImpact+factor" class="Z3988"> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2>[<a href="/w/index.php?title=Impact_factor&action=edit&section=19" title="Edit section: Further reading">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239549316">.mw-parser-output .refbegin{margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}@media screen{.mw-parser-output .refbegin{font-size:90%}}</style><div class="refbegin" style=""> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation journal cs1"><a rel="nofollow" class="external text" href="http://www.aps.org/publications/apsnews/200604/impact.cfm">"Does the 'Impact Factor' Impact Decisions on Where to Publish?"</a>. APS News. 15 (4). <a href="/wiki/American_Physical_Society" title="American Physical Society">American Physical Society</a>. April 2006. Retrieved 1 July 2010.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=APS+News&rft.atitle=Does+the+%27Impact+Factor%27+Impact+Decisions+on+Where+to+Publish%3F&rft.volume=15&rft.issue=4&rft.date=2006-04&rft_id=http%3A%2F%2Fwww.aps.org%2Fpublications%2Fapsnews%2F200604%2Fimpact.cfm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AImpact+factor" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGarfield1999" class="citation journal cs1">Garfield E (October 1999). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1230709">"Journal impact factor: a brief review"</a>. CMAJ. 161 (8): 979–80. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1230709">1230709</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/10551195">10551195</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=CMAJ&rft.atitle=Journal+impact+factor%3A+a+brief+review&rft.volume=161&rft.issue=8&rft.pages=979-80&rft.date=1999-10&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC1230709%23id-name%3DPMC&rft_id=info%3Apmid%2F10551195&rft.aulast=Garfield&rft.aufirst=E&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC1230709&rfr_id=info%3Asid%2Fen.wikipedia.org%3AImpact+factor" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGilbert2010" class="citation journal cs1">Gilbert N (November 2010). <a rel="nofollow" class="external text" href="https://doi.org/10.1038%2F468357a">"UK science will be judged on impact"</a>. Nature. 468 (7322): 357. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2010Natur.468..357G">2010Natur.468..357G</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038%2F468357a">10.1038/468357a</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/21085146">21085146</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nature&rft.atitle=UK+science+will+be+judged+on+impact&rft.volume=468&rft.issue=7322&rft.pages=357&rft.date=2010-11&rft_id=info%3Apmid%2F21085146&rft_id=info%3Adoi%2F10.1038%2F468357a&rft_id=info%3Abibcode%2F2010Natur.468..357G&rft.aulast=Gilbert&rft.aufirst=N&rft_id=https%3A%2F%2Fdoi.org%2F10.1038%252F468357a&rfr_id=info%3Asid%2Fen.wikipedia.org%3AImpact+factor" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGroesser2012" class="citation journal cs1">Groesser SN (2012). <a rel="nofollow" class="external text" href="https://www.alexandria.unisg.ch/211639/1/Groesser_Dynamics%20of%20impact%20factors.pdf">"Dynamics of Journal Impact Factors"</a> (PDF). Systems Research and Behavioral Science. 29 (6): 624–644. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2Fsres.2142">10.1002/sres.2142</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Systems+Research+and+Behavioral+Science&rft.atitle=Dynamics+of+Journal+Impact+Factors&rft.volume=29&rft.issue=6&rft.pages=624-644&rft.date=2012&rft_id=info%3Adoi%2F10.1002%2Fsres.2142&rft.aulast=Groesser&rft.aufirst=SN&rft_id=http%3A%2F%2Fwww.alexandria.unisg.ch%2F211639%2F1%2FGroesser_Dynamics%2520of%2520impact%2520factors.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AImpact+factor" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLariviereSugimoto2018" class="citation arxiv cs1">Lariviere V, Sugimoto CR (2018). "The Journal Impact Factor: A brief history, critique, and discussion of adverse effects". <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<a rel="nofollow" class="external text" href="https://arxiv.org/abs/1801.08992">1801.08992</a> [<a rel="nofollow" class="external text" href="https://arxiv.org/archive/cs.DL">cs.DL</a>].</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=preprint&rft.jtitle=arXiv&rft.atitle=The+Journal+Impact+Factor%3A+A+brief+history%2C+critique%2C+and+discussion+of+adverse+effects&rft.date=2018&rft_id=info%3Aarxiv%2F1801.08992&rft.aulast=Lariviere&rft.aufirst=V&rft.au=Sugimoto%2C+CR&rfr_id=info%3Asid%2Fen.wikipedia.org%3AImpact+factor" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMarcusOransky2015" class="citation news cs1">Marcus A, Oransky I (22 May 2015). <a rel="nofollow" class="external text" href="https://www.nytimes.com/2015/05/23/opinion/whats-behind-big-science-frauds.html">"What's Behind Big Science Frauds?"</a>. Opinion. The New York Times.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+New+York+Times&rft.atitle=What%27s+Behind+Big+Science+Frauds%3F&rft.date=2015-05-22&rft.aulast=Marcus&rft.aufirst=A&rft.au=Oransky%2C+I&rft_id=https%3A%2F%2Fwww.nytimes.com%2F2015%2F05%2F23%2Fopinion%2Fwhats-behind-big-science-frauds.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AImpact+factor" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.scimagojr.com/journalrank.php?wos=false">"Journal & Country Rank: Rankings by Scopus and Scimago Lab"</a>. Scopus and Scimago Lab. Scimago. Retrieved 23 October 2018.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Scopus+and+Scimago+Lab&rft.atitle=Journal+%26+Country+Rank%3A+Rankings+by+Scopus+and+Scimago+Lab&rft_id=https%3A%2F%2Fwww.scimagojr.com%2Fjournalrank.php%3Fwos%3Dfalse&rfr_id=info%3Asid%2Fen.wikipedia.org%3AImpact+factor" class="Z3988"></li></ul> </div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output 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href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Academic_publishing" title="Template:Academic publishing"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Academic_publishing" title="Template talk:Academic publishing"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Academic_publishing" title="Special:EditPage/Template:Academic publishing"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Academic_publishing" style="font-size:114%;margin:0 4em"><a href="/wiki/Academic_publishing" title="Academic publishing">Academic publishing</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Journals</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Academic_journal" title="Academic journal">Academic journal</a></li> <li><a href="/wiki/Scientific_journal" title="Scientific journal">Scientific journal</a> <ul><li><a href="/wiki/Public_health_journal" title="Public health journal">Public health</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Papers</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Academic_publishing#Scholarly_paper" title="Academic publishing">Paper</a> <ul><li><a href="/wiki/Abstract_(summary)" title="Abstract (summary)">Abstract</a></li></ul></li> <li><a href="/wiki/Review_article" title="Review article">Review article</a></li> <li><a href="/wiki/Position_paper" title="Position paper">Position paper</a></li> <li><a href="/wiki/Literature_review" title="Literature review">Literature review</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Grey_literature" title="Grey literature">Grey literature</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Working_paper" title="Working paper">Working paper</a></li> <li><a href="/wiki/White_paper" title="White paper">White paper</a></li> <li><a href="/wiki/Technical_report" title="Technical report">Technical report</a></li> <li><a href="/wiki/Annual_report" title="Annual report">Annual report</a></li> <li><a href="/wiki/Pamphlet" title="Pamphlet">Pamphlet</a></li> <li><a href="/wiki/Essay" title="Essay">Essay</a></li> <li><a href="/wiki/Open-notebook_science" title="Open-notebook science">Lab notes</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other publication types</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Thesis" title="Thesis">Thesis</a></li> <li><a href="/wiki/Collection_of_articles" title="Collection of articles">Collection of articles</a></li> <li><a href="/wiki/Patent" title="Patent">Patent</a> <ul><li><a href="/wiki/Biological_patent" title="Biological patent">Biological</a></li> <li><a href="/wiki/Chemical_patent" title="Chemical patent">Chemical</a></li></ul></li> <li><a href="/wiki/Book" title="Book">Book</a> <ul><li><a href="/wiki/Monograph" title="Monograph">Monograph</a></li> <li><a href="/wiki/Chapter_(books)" title="Chapter (books)">Chapter</a></li></ul></li> <li><a href="/wiki/Poster_session" title="Poster session">Poster session</a></li> <li><a href="/wiki/Conference_proceedings" title="Conference proceedings">Proceedings</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Impact and ranking</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acknowledgment_index" title="Acknowledgment index">Acknowledgment index</a></li> <li><a href="/wiki/Altmetrics" title="Altmetrics">Altmetrics</a></li> <li><a href="/wiki/Article-level_metrics" title="Article-level metrics">Article-level metrics</a></li> <li><a href="/wiki/Author-level_metrics" title="Author-level metrics">Author-level metrics</a></li> <li><a href="/wiki/Bibliometrics" title="Bibliometrics">Bibliometrics</a></li> <li><a href="/wiki/Citation_impact" title="Citation impact">Citation impact</a></li> <li><a href="/wiki/Citation_index" title="Citation index">Citation index</a></li> <li><a href="/wiki/Journal_ranking" title="Journal ranking">Journal ranking</a></li> <li><a href="/wiki/Eigenfactor" title="Eigenfactor">Eigenfactor</a></li> <li><a href="/wiki/H-index" title="H-index">h-index</a></li> <li><a class="mw-selflink selflink">Impact factor</a></li> <li><a href="/wiki/SCImago_Journal_Rank" title="SCImago Journal Rank">SCImago Journal Rank</a></li> <li><a href="/wiki/Scientometrics" title="Scientometrics">Scientometrics</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Reform and access</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Academic_journal_publishing_reform" title="Academic journal publishing reform">Academic journal publishing reform</a></li> <li><a href="/wiki/Open_access" title="Open access">Open access</a> <ul><li><a href="/wiki/Open_access_citation_advantage" title="Open access citation advantage">Citation advantage</a></li></ul></li> <li><a href="/wiki/Serials_crisis" title="Serials crisis">Serials crisis</a></li> <li><a href="/wiki/Sci-Hub" title="Sci-Hub">Sci-Hub</a></li> <li><a href="/wiki/ICanHazPDF" title="ICanHazPDF">#ICanHazPDF</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Versioning</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Preprint" title="Preprint">Preprint</a></li> <li><a href="/wiki/Postprint" title="Postprint">Postprint</a></li> <li><a href="/wiki/Version_of_record" title="Version of record">Version of record</a></li> <li><a href="/wiki/Erratum" title="Erratum">Erratum</a></li> <li><a href="/wiki/Retraction_in_academic_publishing" title="Retraction in academic publishing">Retraction</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_academic_databases_and_search_engines" title="List of academic databases and search engines">Indexes and search engines</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Google_Scholar" title="Google Scholar">Google Scholar</a></li> <li><a href="/wiki/AMiner_(database)" title="AMiner (database)">AMiner</a></li> <li><a href="/wiki/BASE_(search_engine)" title="BASE (search engine)">BASE</a></li> <li><a href="/wiki/CORE_(research_service)" title="CORE (research service)">CORE</a></li> <li><a href="/wiki/Semantic_Scholar" title="Semantic Scholar">Semantic Scholar</a></li> <li><a href="/wiki/Scopus" title="Scopus">Scopus</a></li> <li><a href="/wiki/Web_of_Science" title="Web of Science">Web of Science</a></li> <li><a href="/wiki/Paperity" title="Paperity">Paperity</a></li> <li><a href="/wiki/OpenAlex" title="OpenAlex">OpenAlex</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related topics</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Imprint_(trade_name)" title="Imprint (trade name)">Imprint</a></li> <li><a href="/wiki/Scientific_writing" 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