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The Metrics Toolkit explore by different types of publications and select metrics for particular types of impact, research and discipline.
Library Services on these topics see the Scholarly Communication section of Research Services & Digital Strategies unit:
Journal/source metrics are used in indicators that assess the prestige of the journal within its field. There are several types of these metrics (see below), each proprietary to the provider who offers the calculation.
Examples of indicators that use journal prestige scores include:
JOURNAL-LEVEL METRICS
For more information see Measuring a Journal's Impact
Journal Impact Factor is calculated by dividing all citations to the journal in the current JCR year to items published in the previous two years by the total number of scholarly items (articles, reviews, and proceedings papers) published in the journal in the previous two years. It works best for fast-moving fields.
The 5-year Impact Factor, available from 2007 onward, is the average number of times articles from the journal published in the past five years have been cited in the JCR year. It is best used to compare journals in a field with longer publication times
**Limitation: this metric is influenced by citing behaviour of a discipline and should not be used for comparison purposes.**
The Eigenfactor weights citations so that highly-cited journals influence the score more than less-cited journals. It uses a 5-year publication window and removes journal self-citations.
You may also see a Normalized Eigenfactor Score reported. This rescales the Eigenfactor relative to the number of journals included in the Journal Citation Report that year, setting the average score to 1. A journal with a Normalized Eigenfactor Score of 2 is considered twice as influential as the average journal.
**Caution: the non-normalized metric is influenced by publishing behaviour of a discipline. The normalized score should for comparison purposes.**
The metric is a complex calculation that compares each journal’s citations per publication with the citation potential of its field, defined as the set of publications citing that journal. It measures contextual citation impact and enables direct comparison of journals in different subject fields, since the value of a single citation is greater for journals in fields where citations are less likely, and vice versa.
This metric is based on the concept of a transfer of prestige between journals via their citation links - similar to the concept of Google's PageRank algorithm. The algorithm assumes that important websites are linked to from other important websites. The SJR calculation weights each incoming citation to a journal by the SJR of the citing journal, with a citation from a high-SJR source counting for more than a citation from a low-SJR source.
**Limitation: It should be used for comparison only within a subject area.**
Calculating the CiteScore is based on the number of citations to documents (articles, reviews, conference papers, book chapters, and data papers) by a journal over four years, divided by the number of the same document types indexed in Scopus and published in those same four years.
CiteScore is calculated for the current year on a monthly basis until it is fixed as a permanent value in May the following year, permitting a real-time view on how the metric builds as citations accrue. Once fixed, the other CiteScore metrics are also computed and contextualise this score with rankings and other indicators to allow comparison.