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Metrics

Citation metrics are a quantitative indicator of the reach of a publication.  When using metrics, it is important to include the time frame the metric refers to, as well as the source of the metric, and the date it was accessed.

Other Resources

 

Author-level Metrics

The below table lists a selection of author-level metrics, with a brief description and where to access them. 

 

Metric Description Field weighted Tool
h-index

Indicates the number of articles (h) that have been cited at least (h) number of times. e.g. A researcher with an h-index of 10 has published 10 articles that have been cited at least 10 times each.

 

No

Scopus (Elsevier)

Web of Science (Clarivate Analytics)

Google Scholar Citations

Field-Weighted Citation Impact (FWCI)

 

The ratio of citations received relative to the expected world average.   A field-weighted citation impact of 1 indicates the expected global average number of citations have received.  More than 1 indicates the expected global average has been exceeded, and less than 1 shows the expected global average has not been met. 

Yes

SciVal (Elsevier)

Category-Normalized Citation Impact (CNCI)

Calculated by dividing the actual count of citing items by the expected citation rate for documents with the same document type, year of publication and subject area.

A CNCI of 1 represents performance at par with world average, values above 1 are considered above average and values below 1 are considered below average.

Yes InCites (Clarivate Analytics)
Citations per publication The number of citations received by an entity, divided by the number of publications produced by the entity.  Also known as 'Citation impact' in InCites. No

SciVal (Elsevier)

InCites (Clarivate Analytics)

Author-Level Eigenfactor

A weighted measure based on an author's citations, excluding self-citations. It adjusts for the number of authors of the paper, the number of outgoing citations from each paper citing an author's paper and for the importance of the citing paper. 

The score reported in the Social Science Research Networ (SSRN) ranking tables is calculated from SSRN citation data only

Yes

SSRN (Elsevier)

 

Journal-level Metrics

The below table lists a selection of journal-level metrics, a brief description and how to access them.

Metric Description Field-weighted Tool
SCImago Journal Rank (SJR) Calculated using a methodology similar to the Google PageRank. It weights the value of a citation depending on the field, quality and reputation of the journal that the citation comes from, so that “all citations are not equal”. Yes

SCImago (Scimago Lab)

Scopus (Elsevier)

Journal Impact Factor (JIF) Number of citations within one year to items published in the last two years.  This metric is also available excluding journal self-cites and as a five-year impact factor No Journal Citation Reports (Clarivate Analytics)
CiteScore Calculated by dividing the number of citations received by a journal in a calendar year, by the number of documents published by the journal in the preceding three years.  No Scopus (Elsevier)
Source Normalised Impact per Paper (SNIP) The number of citations received in the present year by papers published in the previous three years, divided by the total number of papers in the past three years. To normalise for differences in citation behaviour between fields, the value of a citation is determined by the number of references in the citing articles reference list. Yes Scopus (Elsevier)
Eigenfactor Score Based on the number of citations to articles from the past five years in the JCR year, taking into account which journals those citations have come from and adjusting for differences in citation patterns across disciplines Yes Journal Citation Reports (Clarivate Analytics)
h-index

Indicates the number of articles (h) that have been cited least (h) number of times. e.g. A journal with an h-index of 400 has published 400 articles that have been cited at least 400 times each.

No SCImago (Scimago Lab)
Article Influence Score Calculated by dividing the Eigenfactor score of the journal by the number of articles published. It tells the average impact of an article published in a journal from a five year period after the publication of the article. Yes Journal Citation Reports (Clarivate Analytics)