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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.
For instance, most papers in Nature (impact factor 38.1, 2016) were only cited 10 or 20 times during the reference year (see figure). Journals with a lower impact (e.g. PLOS ONE, impact factor 3.1) publish many papers that are cited 0 to 5 times but few highly cited articles. [21]
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]
The journal became online-only in January 2018. The final print issue was published in October 2017. According to the Journal Citation Reports, the journal has a 2023 impact factor of 19.0. [1] The journal was established in January 1988. [2] The founding editor was Josephine A. Morello (University of Chicago Medical Center). [2]
The full archive back to 1878 up to issues published 12 months from the current date is freely available online. The editor-in-chief is Kim Barrett (University of California, Davis). According to the Journal Citation Reports, the journal has a 2022 impact factor of 5.5. [1]
The International Journal of Energy Research is a peer-reviewed open-access scientific journal published by John Wiley & Sons. It covers fossil, nuclear, and renewable energy sources, and research into energy storage. It was established in 1977 and the editor-in-chief is Akshay Kumar Saha.
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]