Evaluating a journal's merit requires comparing it to the median or quartiles within its specific subject category to ensure the assessment is meaningful and contextually relevant. This specific metric, calculated annually by Clarivate Analytics for journals indexed in the Science Citation Index Expanded or Social Sciences Citation Index, assigns a number indicating the average number of citations received per peer-reviewed document published in that journal over a preceding two-year window.
Journal Impact Factor Calculation Steps
The metric inherently favors large, established journals in broad disciplines, as they accumulate more citations simply due to volume. Universities often use it to benchmark the performance of their departments, influencing decisions regarding library subscriptions and research strategy.
A high impact factor in theoretical mathematics might represent a different level of influence than the same number in experimental oncology, where the volume of publications and citations naturally differs. Clarivate has introduced the Journal Citation Reports with enhanced transparency, and many advocate for moving towards article-level metrics that track influence on a per-article basis.
Journal Impact Factor Calculation Steps
The resulting figure is not arbitrary; it is a direct product of the indexing protocols and the specific universe of journals under consideration, making it a reproducible, albeit imperfect, measure. It involves counting all citations received in a given year to articles published in the two previous years.
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