The Journal Impact Factor measures the number of citations received in a given year by articles published in a journal in the two preceding years.
This measurement was developed by Clarivate Analytics (formally Thomson Reuters) and can be used to compare and rank journals in science and social science disciplines.
Journal Citation Reports (JCR) allows you to search for individual journals or to compare groups of journals by subject category. This is useful for researchers wanting to identify journals relevant to their research or in which to publish.
JCR provides a range of metrics for each journal, including:
impact over 2 and 5 years
how quickly things get cited
if citing continues over a long period of time
Caveats to Journal Citation Reports
JCR provides access to citation statistics from 1997 onwards and is limited to the citation data of journals indexed in the Web of Science Database.
JCR should only be used to compare and rank journals in the same discipline as citation patterns vary across disciplines.
New journals are likely to receive an impact factor only after two years of indexing.
"SNIP is derived by taking a journal's citation count per paper and dividing it by the citation potential in its subject field." Scopus. (2016, September 13). Journal Metrics in Scopus: Sourced Normalized Impact per Paper [Weblog post]. Retrieved May 2018 from https://blog.scopus.com/posts/journal-metrics-in-scopus-source-normalized-impact-per-paper-snip
The data for the calculations is drawn from the Scopus Database and includes citations from the last three years.
CiteScore is a set of journal metrics produced by Elsevier and calculated using citation data from Scopus.
A journal's CiteScore represents the average number of citations received in the CiteScore year (e.g. 2015), by papers published in the three preceding years (e.g. 2012, 2013, and 2014).
A CiteScore calculation includes all document types (research articles, review articles, conference proceedings, editorials errata, letters, notes and short surveys). CiteScore data is updated yearly.
Please note: The CiteScore metric cannot be used to compare journals across different disciplines. Use Journal impact measures together with other metrics as a single number does not provide a comprehensive picture.
Journal Citation reports are not published in the Arts and Humanities, so no impact factors are available for these disciplines. Alternative measures of quality are available through the following lists: