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Journal Metrics

Dear Librarian,

We're pleased to announce the release of the new SNIP and SJR metric values for the years 1999-2011 (2011 full year included). This new release offers an up-to-date overview journal performance in terms of citations and ranking. These SNIP and SJR values have been modified and are currently available on Take this opportunity to analyze your journals of interest it's free.

Download the new figures

Modifications to the SNIP and SJR metrics
Leiden University's Centre for Science & Technology Studies CWTS (for SNIP) and SCImago Research Group (for SJR) have introduced a number of modifications to their metrics. These modified metrics are called SNIP2 and SJR2 and can be found in the value file.

SNIP modifications:
The aim of the SNIP modification is to further improve the mechanism used by the SNIP metric to correct for differences in citation practices between scientific fields. In this way, the accuracy of comparisons of the citation impact of journals from different fields will increase.

SJR modifications:
The refined SJR2 now recognizes the value of citations from closely related journals, compensates for an ever increasing volume of journals, and makes comparison easier with an average value equal to one.

Read more on the SNIP and SJR modifications.

The new journal metrics are also available on and can be found under the 'Sources' tab, and via the Journal Analyzer under the 'Analytics' tab. The values are also freely available, with additional supplementary information, from CWTS at and from SCImago Research Group at

Best regards,

The Journal Metrics team

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