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The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science.
The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science.
According to Journal Citation Reports, the journal has a 2022 impact factor of 9.4. [1] PNAS is the second most cited scientific journal, with more than 1.9 million cumulative citations from 2008 to 2018. [2] In the past, PNAS has been described variously as "prestigious", [3] [4] "sedate", [5] "renowned" [6] and "high impact". [7]
The Emerging Sources Citation Index (ESCI) is a citation index produced since 2015 by Thomson Reuters and now by Clarivate. According to the publisher, the index includes "peer-reviewed publications of regional importance and in emerging scientific fields". [1] The ESCI is accessible through the Web of Science, together with other Clarivate ...
In any given year, the CiteScore of a journal is the number of citations, received in that year and in previous three years, for documents published in the journal during the total period (four years), divided by the total number of published documents (articles, reviews, conference papers, book chapters, and data papers) in the journal during the same four-year period: [3]
Journal ranking is widely used in academic circles in the evaluation of an academic journal's impact and quality. Journal rankings are intended to reflect the place of a journal within its field, the relative difficulty of being published in that journal, and the prestige associated with it.
Nature was one of the world's most cited scientific journals by the Science Edition of the 2022 Journal Citation Reports (with an ascribed impact factor of 50.5), [1] making it one of the world's most-read and most prestigious academic journals. [2] [3] [4] As of 2012, it claimed an online readership of about three million unique readers per month.
The journals are grouped into four main sections: Physical Sciences and Engineering; Life Sciences; Health Sciences; Social Sciences and Humanities.; Article abstracts are freely available, and access to their full texts (in PDF and, for newer publications, also HTML) generally requires a subscription or pay-per-view purchase unless the content is freely available in open access.