![]() Thus, the impact factor of a journal is calculated by dividing the number of current year citations to the source items published in that journal during the previous two years (see Figure 1). The annual JCR impact factor is a ratio between citations and recent citable items published. The impact factor is one of these it is a measure of the frequency with which the “average article” in a journal has been cited in a particular year or period. The JCR provides quantitative tools for ranking, evaluating, categorizing, and comparing journals. Users may be tempted to jump to ill-formed conclusions based on impact factor statistics unless several caveats are considered. Informed and careful use of these impact data is essential. And in the ’60s we invented the journal “impact factor.” After using journal statistical data in-house to compile the Science Citation Index (SCI) for many years, Clarivate Analytics began to publish Journal Citation Reports (JCR) 3in 1975 as part of the SCI and the Social Sciences Citation Index (SSCI). 2 However, the advent of the Clarivate Analytics citation indexes made it possible to do computer-compiled statistical reports not only on the output of journals but also in terms of citation frequency. 1 Others, including Estelle Brodman with her studies in the ’40s of physiology journals and subsequent reviews of the process, followed this lead. ![]() Gross and Gross conducted a classic study of citation patterns in the ’20s. Librarians and information scientists have been evaluating journals for at least 75 years. This essay was originally published in the Current Contents print editions June 20, 1994, when Clarivate Analytics was known as The Institute for Scientific Information (ISI). Darts-ip Design and Model Case Law Data.Transform the way you create, manage and protect intellectual property. ![]()
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