Skip directly to content


Journal Metrics in Scopus: Source Normalized Impact per Paper (SNIP)

on Tue, 09/13/2016 - 01:54

In a previous post we began looking at some of the metrics featured in Library Connect’s Quick Reference Cards for Research Impact Metrics and sharing how they relate to Scopus. The first post covered SCImago Journal Rank (SJR). Continuing on with the journal metrics theme, in this post we discuss Source Normalized Impact per Paper (SNIP).

SNIP was created by Professor Henk Moed at the Centre for Science and Technology Studies (CTWS), University of Leiden. It measures contextual citation impact by weighting citations based on the total number of citations in a subject field, using Scopus data.

Or, as stated by the CTWS, “SNIP corrects for differences in citation practices between scientific fields, thereby allowing for more accurate between-field comparisons of citation impact.” (

As shared in the quick reference card displayed, SNIP is derived