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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 correlates with success indicators such as winning the Nobel Prize, being accepted for research fellowships and holding positions at top universities. [1]
Author-level metrics are citation metrics that measure the bibliometric impact of individual authors, researchers, academics, and scholars. Many metrics have been developed that take into account varying numbers of factors (from only considering the total number of citations, to looking at their distribution across papers or journals using statistical or graph-theoretic principles).
the Hirsch index for the citations received (H), the Schreiber co-authorship adjusted Hm index for the citations received (Hm). the total number of citations received to papers for which the scientist is single author (NCS), the total number of citations received to papers for which the scientist is single or first author (NCSF), and
The best-known author-level measures include total citations and the h-index. [16] Each measure has advantages and disadvantages, [17] spanning from bias to discipline-dependence and limitations of the citation data source. [18] Counting the number of citations per paper is also employed to identify the authors of citation classics. [19]
Scopus also offers author profiles which cover affiliations, number of publications and their bibliographic data, references, and details on the number of citations each published document has received. It has alerting features that allow registered users to track changes to a profile and a facility to calculate authors' h-index.
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.
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The h-index became an important indicator of the productivity and impact of the work of a scientist. However, alternative author-level metrics have been proposed. [10] [11] Around the same time, the interest of governments in evaluating research for the purpose of assessing the impact of science funding increased.