Citation analysis is mainly used to evaluate the impact of scholarly articles published by the journals. Journal Impact Factor is utilized to rank the journals based on the underlying assumption that articles published by high impact factor journals are highly cited than low impact factor journals
The Impact Factor is calculated by dividing the number of citations in the current year by the total number of articles published in the two previous years.
The total number of citations received in 2020 from the articles published in 2018 and 2019 is 500.
The total number of articles published in 2018 and 2019 is 60.
Impact factor 2020 = 500/60 = 8.33.
SNIP measures contextual citation impact by weighting citations based on the total number of citations in a subject field. The impact of a single citation is given higher value in subject areas where citations are less likely and vice versa. Unlike the well-known journal impact factor, SNIP corrects for differences in citation practices between scientific fields, thereby allowing for more accurate between-field comparisons of citation impact. As a field-normalized metric, SNIP offers the ability to benchmark and compare journals from different subject areas.
SCImago Journal Rank (SJR), a prestige metric based on all citations, is not created equal. With SJR, the subject field, quality, and reputation of the journal directly affect the value of a citation. It is a size-independent indicator, and it ranks journals by their average prestige per article and can be used for comparison in the scientific evaluation process. https://www.scimagojr.com/
CiteScore for a journal in a given year counts the citations received in that year to documents published in three proceeding years and divides this by the number of documents published in that journal in the same 3-year period. Unlike JIF, document types used in numerator and denominator are the same and include research articles, reviews, conference proceedings, editorials, errata, letters, and short surveys. Articles-in-press are not included in the calculation of CiteScore. https://www.scopus.com/sourceid/17900156715
The h-index is an author-level metric that measures both the productivity and citation impact of the publications, initially used for an individual scientist or scholar. The h-index is defined as the maximum value of h such that the given author/journal has published at least h papers that have each been cited at least h times. The index is designed to improve upon simpler measures such as the total number of citations or publications. The index works best when comparing scholars working in the same field since citation conventions differ widely among different fields.
The i10-index indicates the number of academic publications an author has written that have been cited by at least ten sources.