The Journal Impact Factor is defined as all citations to the journal in the current JCR year to items published in the previous two years, divided by the total number of scholarly items (these comprise articles, reviews, and proceedings papers) published in the journal in the previous two years. For example, the journal impact factor 2019 for a journal would be calculated as follows:
A = the number of times articles published in 2017-2018 were cited in indexed journals during 2019
B = the number of articles, reviews, proceedings or notes published in 2017-2018
Impact Factor 2019 = A/B
3. CiteScoreCiteScore is a way of measuring the citation impact of journals. It calculates the average number of citations received in a calendar year by all items published in that journal in the preceding three years. The calendar year to which a serial title's issues are assigned is determined by their cover dates, and not the dates that the serial issues were made available online. Different from IF, the scholarly items published in the previous 3 years were accounted.