Elsevier releases 2013 Journal Metrics
The metrics provide alternative, transparent and accurate views of the citation impact a journal
makes, and are all available for free download at www.journalmetrics.com. The impact metrics are
based on methodologies developed by external bibliometricians and use Scopus as the data source.
Scopus is the largest citation database of peer-reviewed literature and features tools to track,
analyze and visualize research output.
Source Normalized Impact per Paper (SNIP)
SNIP measures contextual citation impact by weighting citations based on the total number of
citations in a subject field. The impact of a single citation is given higher value in subject areas where
citations are less likely, and vice versa. As a field-normalized metric SNIP offers researchers, authors
and librarians the ability to benchmark and compare journals from different subject areas. A
component of the SNIP calculation is the raw Impact per Publication (IPP) which measures the ratio
of citations per article published in the journal.
SCImago Journal Rank (SJR)
SJR is a prestige metric based on the idea that ‘all citations are not created equal’. With SJR, the
subject field, quality and reputation of the journal have a direct effect on the value of a citation. It is
a size-independent indicator and it ranks journals by their ‘average prestige per article’ and can be
used for journal comparisons in the scientific evaluation process.
The SNIP is developed by Leiden University's Centre for Science & Technology Studies (CWTS). The
SJR is developed by the SCImago research group in Spain.
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