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It uses bibliometric methods to analyze and rank the scientific paper performance. In addition to the overall ranking, it includes a list of the top universities in six fields and fourteen subjects. [4] [5] The rankings were introduced in 2007. The original ranking methodology favored toward universities with medical schools.
Journal ranking is widely used in academic circles in the evaluation of an academic journal's impact and quality. Journal rankings are intended to reflect the place of a journal within its field, the relative difficulty of being published in that journal, and the prestige associated with it.
A journal's SJR indicator is a numeric value representing the average number of weighted citations received during a selected year per document published in that journal during the previous three years, as indexed by Scopus.
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: [3]
Multilevel‐statistical reformulation of citation‐based university rankings: The Leiden ranking 2011/2012. Journal of the American Society for Information Science and Technology, 64(8), 1649–1658. Braun, Tibor et al. (1985). Scientometric indicators: a 32 country comparative evaluation of publishing performance and citation impact.
The methodology of the rankings was changed during the 2011–12 rankings process, with details of the changed methodology here. [26] Phil Baty, the rankings editor, has said that the THE World University Rankings are the only global university rankings to examine a university's teaching environment, as others focus purely on research. [27]
The Nature Index is a database that tracks institutions and countries/territories and their scientific output since its introduction in November 2014. [1] Originally released with 64 natural-science journals, the Nature Index expanded to 82 natural-science journals in 2018, then added 64 health-science journals in 2023.
In a 2010 article, Loet Leydesdorff criticized the method used by the Leiden Ranking to normalize citation impact by subject field. The mean normalized citation score (MNCS) indicator is based on the ISI subject category classification used in Web of Science, which was "not designed for the scientometric evaluation, but for the purpose of ...