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and several measures derived from these data for a given journal: its impact factor, immediacy index, etc. There are separate editions for the sciences and the social sciences; the 2013 science edition includes 8,411 journals, and the 2012 social science edition contains 3,016 titles.
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. [14] [15]
It was established in 1936 and is published by the Society of Exploration Geophysicists. The current editor-in-chief is Jeffrey Shragge (Colorado School of Mines). According to the Journal Citation Reports, the journal has a 2018 impact factor of 2.793. [1]
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]
"A" marks the location of the spacecraft at 12:55 p.m. ET on November 1, 2023, and an inset shows the image captured at that time. "B" marks the spacecraft's position a few minutes later at 1 p.m ...
The Astrophysical Journal Letters (ApJL), established in 1967 by Subrahmanyan Chandrasekhar as Part 2 of The Astrophysical Journal, is now a separate journal focusing on the rapid publication of high-impact astronomical research.
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.
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]