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As a consequence, the impact factor of the journal Acta Crystallographica Section A rose from 2.051 in 2008 to 49.926 in 2009, more than Nature (at 31.434) and Science (at 28.103). [72] The second-most cited article in Acta Crystallographica Section A in 2008 had only 28 citations.
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 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.
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]
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 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 addition to impact rankings by Journal Impact Factor (JIF) Journal Citation Reports, Vanclay analyzed the ranking of 180 forestry journals by several additional metrics, including the h-index. [5] He reported that for the period from 2000 to 2007, the Journal of Forestry ranked number 8 of 180 using the h-index.
However, The BMJ in 2013 reported that it had become a signatory to the San Francisco Declaration on Research Assessment (commonly known as the Dora Agreement), which deprecates the inappropriate use of journal impact factors and urges journal publishers to "greatly reduce the emphasis on the journal impact factor as a promotional tool, ideally ...