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CiteScore (CS) of an
academic journal An academic or scholarly journal is a periodical publication Periodical literature (also called a periodical publication or simply a periodical) is a category of serial Serial may refer to: Arts, entertainment, and media The presentation of w ...
is a measure reflecting the yearly average number of
citation A citation is a reference Reference is a relationship between objects in which one object designates, or acts as a means by which to connect to or link to, another object. The first object in this relation is said to ''refer to'' the second o ...

citation
s to recent articles published in that journal. This journal evaluation metric was launched in December 2016 by
Elsevier Elsevier () is a Netherlands-based publishing Publishing is the activity of making information, literature, music, software and other content available to the public for sale or for free. Traditionally, the term refers to the creation and ...

Elsevier
as an alternative to the generally used JCR
impact factor #REDIRECT Impact factor#REDIRECT Impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly average number of citations of articles publish ...
s (calculated by
Clarivate Clarivate is a company formed in 2016, following the acquisition of Thomson Reuters Thomson Reuters Corporation () is a Canada-based multinational media conglomerate. The company was founded in Toronto, Ontario Toronto is the cap ...
). CiteScore is based on the citations recorded in the
Scopus Scopus is Elsevier Elsevier () is a Netherlands-based publishing company specializing in scientific, technical, and medical content. It is a part of the RELX Group, known until 2015 as Reed Elsevier. Its products include journals such as '' ...
database rather than in JCR, and those citations are collected for articles published in the preceding four years instead of two or five.


Calculation

In any given year, the CiteScore of a journal is the number of citations, received in that year and previous 3 years, for documents published in the journal during that period (four years), divided by the total number of published documents (articles, reviews, conference papers, book chapters, and data papers) in the journal during the same four-year period: \text_ = For example, ''Nature'' had a CiteScore 2019 of 51.0 \text_ = = = 51.0 Note that for example the 2017 CiteScores were reported first in 2018 when all data was available completely. CiteScores are typically released in late May, approximately one month earlier than the JCR impact factors. Note also the calculation date for each given CiteScore as later additions, corrections or deletions to the data will not lead to a score update. Scopus also provides the projected CiteScores for the next year, which are updated every month.


Old calculation

Before 2020 the score was calculated differently: In a given year, the CiteScore of a journal was the number of citations, received in that year, of articles published in that journal during the three preceding years, divided by the total number of "citable items" published in that journal during the three preceding years: \text_ = For example, ''Nature'' had a CiteScore of 14.456 in 2017: \text_ = = = 14.59 Because the calculation method changed, knowing the calculation date is an important detail when comparing CiteScores. For example, the ''Nature'' CiteScore in 2017, but calculated with the method of 2020, is 53.7.CiteScore 2017
243783/4539=53.7


CiteScore vs. Journal Impact Factor

CiteScore was designed to compete with the two-year JCR impact factor, which is currently the most widely used journal metric. Their main differences are as follows: Another difference is the definition of the "number of publications" or "citable items".


References

{{DEFAULTSORT:CiteScore Journal ranking