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Journal Citation Reports (JCR) is an annual publication by Clarivate. [1] It has been integrated with the Web of Science and is accessed from the Web of Science Core Collection. It provides information about academic journals in the natural and social sciences, including impact factors. JCR was originally published as a part of the Science ...
A journal's SJR indicator is a numeric value representing the average number of weighted citations received during a selected year per document published in that journal during the previous three years, as indexed by Scopus. Higher SJR indicator values are meant to indicate greater journal prestige.
Top quartile citation count (TQCC) – reflecting the number of citations accrued by the paper that resides at the top quartile (the 75th percentile) of a journal's articles when sorted by citation counts; for example, when a journal published 100 papers, the 25th most-cited paper's citation count is the TQCC. [5]
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.
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]
In January 2010, it was announced that the journal would be included in the Journal Citation Reports, [39] and the journal received an impact factor of 4.411 in 2010. According to the Journal Citation Reports, the journal has a 2023 impact factor of 2.9.. [40]
According to the Journal Citation Reports the journal had a 2021 impact factor of 4.614, [10] but in February 2023, Clarivate delisted the journal in its main citation indexes (Science Citation Index Expanded and Social Sciences Citation Index), citing "publications that were deemed outside the scope of the journal".
It is the official journal of the European Optical Society and is published by IOP Publishing. The editor-in-chief is Andrew Forbes (University of the Witwatersrand). According to the Journal Citation Reports, the journal has a 2023 impact factor of 2.0. [1]