Scientific metrics
Used to assess the status and prospects of research activities of authors and organisations, compare them and rank them in various ratings.
Hirsch index (H-index) was first proposed by Hirsch, a physicist from the University of California, San Diego. Hirsch is based on the number of publications of a researcher (department, organisation) and the number of their citations. For example, a scientist has a Hirsch index equal to “h” if the “h” of his “N” articles are cited at least “h” times each.
Quartile (Q) is a category of scientific journals defined by bibliometric values reflecting the citation level (demand for the journal by the scientific community). As a result of ranking, each journal falls into one of four quartiles: from Q1 (the highest) to Q4 (the lowest).
Impact Factor (IF) – a numerical indicator of the authority or influence of a scientific journal, updated annually in the Web of Science Core Collection: Journal Citation Reports (JCR) database. Journal impact factor is calculated for a specific (reporting) year; it characterises the average number of citations received in the reporting year by the journal articles published during the previous years. Impact factors are not calculated for humanities journals.
Category Normalised Citation Impact (CNCI) – normalised average citation rate for a subject area in the InCites system. A measure of scholarly performance when compared independently of subject area. The CNCI of a publication is calculated as the ratio of the citation of the publication to the average citation of all publications of the same type published in the same year and in the same subject area.
SCImago Journal Rank (SJR) is a ranking of journals indexed in the Scopus database that takes into account not only the total number of citations, but also weighted citation rates by year and qualitative measures such as citation authority.
Field-Weighted Citation Impact (FWCI) - citation index in SciVal system, weighted by discipline, is calculated as the ratio of the number of citations of publications of the object to the average number of citations received by all other similar publications in the world. To calculate the indicator, citations received in the year of publication of the work, as well as in the following three years are taken into account, the world average value is equal to one.