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Journal Metrics: SCImago & SNIP

This guide describes what the journal impact factor (JIF or IF) is, criticisms of IF, how to use IF responsibly, and other journal IFs being developed by other organizations.

SCIMago Journal & Country Rank (SJR)

SCImago Journal & Country Rank (SJR) is a free source that includes the journal and country scientific indicators developed from Elsevier’s Scopus database.  It ranks journals and compares journal citations among countries.  Journals are assigned to major thematic categories as well as to specific subject categories according to Scopus Classification.

The SJR (SCImago Journal Rank) indicator expresses the average number of weighted citations received in the selected year by the documents published in the selected journal in the three previous years:  i.e., weighted citations received in year X (2011) to documents published in the journal in years X-1 (2010), X-2 (2009), and X-3 (2008).  For more information, see Description of SCImago Journal Rank Indicator.


How to find journal ranking in SJR:

1.     Go to SJR and click on Journal Rankings

2.     Select Subject Area, e.g., Dentistry

3.     Select Subject Category, e.g. Oral Surgery

4.     Select other categoreis as needed and click Refresh.



Created by Professor Henk Moed at CTWS, University of Leiden, Source-Normalized Impact per Paper (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.

It is defined as the ratio of a journal’s citation count per paper and the citation potential in its subject field.  It aims to allow direct comparison of sources in different subject fields.  Citation potential is shown to vary not only between journal subject categories – groupings of journals sharing a research field – or disciplines (e.g., journals in Mathematics, Engineering and Social Sciences tend to have lower values than titles in Life Sciences), but also between journals within the same subject category.  For instance, basic journals tend to show higher citation potentials than applied or clinical journals, and journals covering emerging topics higher than periodicals in classical subjects or more general journals.

SNIP corrects for such differences. Its strengths and limitations are open to critical debate.  All empirical results are derived from the Scopus abstract and indexing database.  SNIP values are updated twice a year, providing an up-to-date view of the research landscape.

SNIP provides alternative values that bibliometricians can use to create more refined and objective analyses, including measuring the quality of the research output of universities (research performance) and helping governments and universities allocate research funding.

It helps editors evaluate their journal and understand how it is performing compared to its competition.  SNIP provides more contextual information and can give a better picture of specific fields, such as Engineering, Computer Science, and/or Social Sciences.  It can also help all academics identify which journals are performing best within their subject field so they know where to publish.

From the Elsevier/Scopus/JournalM3trics website.

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