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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.
A study published in 2021 compared the Impact Factor, Eigenfactor Score, SCImago Journal & Country Rank and the Source Normalized Impact per Paper, in journals related to Pharmacy, Toxicology and Biochemistry. It discovered there was "a moderate to high and significant correlation" between them. [25]
While these journals still did not receive an impact factor until the next year, they did contribute citations to the calculation of other journals' impact factors. [4] [5] In July 2022, Clarivate announced that journals in the ESCI obtain an impact factor effective from JCR Year 2022 first released in June 2023. [6]
When science journals were evaluated with a PageRank-based algorithm, however, the Journal of Biological Chemistry ranked first. [7] Using the Eigenfactor metric, the Journal of Biological Chemistry ranked 5th among all ISI-indexed journals in 2010. [8] The impact factor of the journal in 2021 was 5.486. [9]
The values for Nature journals lie well above the expected ca. 1:1 linear dependence because those journals contain a significant fraction of editorials. CiteScore was designed to compete with the two-year JCR impact factor, which is currently the most widely used journal metric. [7] [8] Their main differences are as follows: [9]
According to the Journal Citation Reports, the journal has a 2021 impact factor of 13.263, ranking it 5th out of 238 journals in the category "Plant Sciences" [1] and 8th out of 158 journals in the category "Biotechnology & Applied Microbiology". [2] As an Open Access journal, articles are accessible globally without restriction.
According to the Journal Citation Reports, the journal has a 2021 impact factor of 11.500, ranking it 21st out of 179 journals in the category "Chemistry, Multidisciplinary" [2] and 2nd out of 57 journals in the category "Mathematical & Computational Biology". [3]