Journal Impact Factor (and other scientometric indicators)
The Journal Impact Factor (JIF), determined by Clarivate Analytics, is currently the most established and widely used scientometric/bibliometric indicator at journal level.
The JIF of a journal is the average number of citations received in a given year by articles published in that journal during the two preceding years. The greater the value, the more influential the journal. However, the value range differs greatly depending on the field of research.
The previous year’s results are published annually (around the middle of the year) in the Journal Citation Reports.
CiteScore, SCImago Journal Ranking and Source Normalized Impact per Paper are three further well-established scientometric indicators on journal level. They are based on the Scopus data. Each summer, the figures for the previous year are released.
CiteScore measures like the Journal Impact Factor average citations received per document published in a specific journal. Instead of a two-year window CiteScore uses a three-year window.
SCImago Journal Ranking (SJR) accounts for both the number of citations received by a journal and the importance of the journals where such citations come from. SJR computation uses an algorithm similar to Google PageRank.
Source Normalized Impact per Paper (SNIP) measures contextual citation impact by weighting citations based on the total number of citations in a subject field. SNIP is defined as the ratio of a journal's citation count per paper and the citation potential in its subject field. It aims to allow direct comparison of sources in different subject fields.