CiteScore

In any given year, the CiteScore of a journal is the number of citations, received in that year and in previous three years, for documents published in the journal during the total 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{CS}_{2021} = {\text{Citations}_{2021} + \text{Citations}_{2020} + \text{Citations}_{2019} + \text{Citations}_{2018} \over \text{Publications}_{2021} + \text{Publications}_{2020} + \text{Publications}_{2019} + \text{Publications}_{2018}} = {338611 \over 4823 } = 70.2 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. Scopus also provides the projected CiteScores for the next year, which are updated every month. \text{CS}_{y} = {\text{Citations}_{y}\over \text{Publications}_{y-1} + \text{Publications}_{y-2} + \text{Publications}_{y-3}} For example, Nature had a CiteScore of 14.456 in 2017: \text{CS}_{2017} = {\text{Citations}_{2017}\over \text{Publications}_{2016} + \text{Publications}_{2015} + \text{Publications}_{2014}} = {114639 \over 7860 } = 14.59 Because the calculation method changed, knowing the calculation date is an important detail when comparing CiteScores. For example, the Nature CiteScore for 2017 calculated with the post-2020 method is 53.7. == Comparison to JCR Impact Factor==