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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.
Mount Sinai Journal of Medicine: Medicine: John Wiley & Sons: English: 1934–2012 Movement Disorders: Neurology: Wiley-Liss: English: 1986–present Myanmar Medical Journal: Medicine: Myanmar Medical Association: English: 1953–present Nano Biomedicine and Engineering: Medicine: Open-Access House of Science and Technology: English: 2009–present
Journal ranking is widely used in academic circles in the evaluation of an academic journal's impact and quality. Journal rankings are intended to reflect the place of a journal within its field, the relative difficulty of being published in that journal, and the prestige associated with it.
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.
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]
For a long time, the journal's sole competitor was The Lancet, also based in the UK, but with increasing globalization, The BMJ has faced tough competition from other medical journals, particularly The New England Journal of Medicine and the Journal of the American Medical Association, [11] now known as JAMA.
Scopus is a scientific abstract and citation database, launched by the academic publisher Elsevier as a competitor to older Web of Science in 2004. [1] An ensuing competition between the two databases has been characterized as "intense" and is considered to significantly benefit their users in terms of continuous improvent in coverage, search/analysis capabilities, but not in price.
Journals that are recognized as general medical journals include The Lancet, the New England Journal of Medicine, [2] and the Annals of Internal Medicine. [7] In 2009, the three highest-ranked general medical journals by impact factor were JAMA, The Lancet, and the New England Journal of Medicine. [8]