Scopus uses three metrics:
- SJR (SCImago Journal Rank) - SJR assigns relative scores to all of the sources in a citation network. Its methodology is inspired by the Google PageRank algorithm, in that not all citations are equal. A source transfers its own 'prestige', or status, to another source through the act of citing it. A citation from a source with a relatively high SJR is worth more than a citation from a source with a lower SJR. (from Elsevier)
- SNIP (Source Normalized Impact per Paper) - SNIP measures a source’s contextual citation impact. It helps you make a direct comparison of sources in different subject fields. SNIP takes into account characteristics of the source's subject field, which is the set of documents citing that source. SNIP especially considers: the frequency at which authors cite other papers in their reference list, the speed at which citation impact matures, and the extent to which the database used in the assessment covers the field’s literature. (adapted from Elsevier)
- h-index - The document number and the number of times the document has been cited. The document number indicates where the document falls on the h-index. For example, a document number of 1 is given to the highest cited paper.
The SJR and SNIP of journals can be compared by using the Journal Analyzer tool. An author's h-index is listed on the author profile page.