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DataBank: Article Level Metrics & Citation Analysis: SNIP: Source Normalized Impact

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Introduction

"...the Centre for Science and Technology Studies (CWTS) of Leiden University developed for Elsevier Scopus an indicator called the source normalized impact per paper (SNIP, see Moed, 2009). This indicator can be seen as an important alternative to the impact factor.

SNIP, produced by CWTS and powered by Scopus, "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.

  • Measures contextual citation impact by normalizing citation values
  • Takes a research field's citation frequency into account
  • Considers immediacy - how quickly a paper is likely to have an impact in a given field
  • Accounts for how well the field is covered by the underlying database
  • Counter any potential for editorial manipulation"