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Scopus Journal Metrics SNIP & SJR


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Elsevier's upgraded the Journal Analyzer with Source Normalized Impact per Paper (SNIP), which measures a source's contextual impact, and SCImago Journal Rank (SJR), which measures the scientific prestige of scholarly sources.

These indicators will be applied to all journals indexed by Scopus and will be freely available to both subscribers and non-subscribers @ and

Published in: Education, Technology
  • It is stated that SNIP and SJR are manipulation-proof. Given the demonstrated ingenuity of academics in manipulating IF, this seems extremely unlikely.
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Scopus Journal Metrics SNIP & SJR

  1. 1. Journal Ranking Metrics SNIP & SJR – A new perspective in Journal Performance Management
  2. 2. “Using the Impact Factor alone to judge a journal is like using weight alone to judge a person’s health.” Source: The Joint Committee on Quantitative Assessment of Research: “Citation Statistics”, a report from the International Mathematical Union
  3. 3. “There is no single ‘best’ indicator that could accommodate all facets of the new reality of Journal Metrics.” - Wolfgang Glänzel, Centre for R&D Monitoring, ECOOM Leuven, Belgium , g Bibliometrics – A discipline that uses statistical methods to analyze content and measure research performance.
  4. 4. Users demand alternative to Impact Factor Assign value to Scopus- - “How do impact factors of journals in Scopus, especially ditor unique content, especially q , p y those not covered by Web of Science, compare to those y , p Ed regional content indexed in WoS?” Lopez-Illescas et al, J Informetrics, 2008, p304-316 Journal quality is a key aspect - “Basically, I measure good research by papers. The better of performance evaluation f f l ti the th papers, the b tt my research. So the I th better h S th Impact F t t Factor. Scientist Quite simple.” Group Leader, Netherlands - “Impact Factor is considered one of the crucial citation indicators widely used in research assessment and science S administration.” Pislyakov, 2008, Scientometrics p1-10 ublisher Librarian Facilitates Scopus adoption if p p - “It is a no-brainer – the only thing missing from Scopus to y g g p faced with switch from WoS really take over from ISI is legitimate journal metrics.” Inn Beng Lee, Head of Customer Marketing, Asia Pacific Increases willingness of other -“This will have a very positive effect on our relationship with publishers to cooperate other publishers and spur collaboration to ensure full coverage.” Ove Kähler, Senior Product Manager for Scopus Content, Netherlands N th l d Pu
  5. 5. How would you know that all of these journals are the best? Journal Impact Factor 2008* Lancet Infectious Diseases 13.165 Social St di S i l Studies of S i f Science 1.343 1 343 Dyes & Pigments 2.507 Expert Systems with Applications 2.596 2 596 Progress in Nuclear Magnetic Resonance 6.162 Spectroscopy Communications on Pure & Applied Mathematics 3.806 Citation behaviour is different per field • Frequency of publication • Number ofCitation Reports 2009 *Journal authors •LLength of reference li h f f list How do you compare with confidence?
  6. 6. Our approach Not one-dimensional, but multi-dimensional approach Make metrics freely available y Don’t invent metrics ourselves – ask the external experts Survey what’s out there Meet experts to understand how metrics meet user needs Calculate test data for metric shortlist Decide with advice from the internal experts, Academic Relations Result – endorse SJR and SNIP Neither are ‘leading’ – both are given equal importance Secure support from publishing divisions
  7. 7. 3-year citation window = fairest compromise To which years are citations made in 2007 directed? 10 Immunology and Microbiology (67,9%) 9 Biochemistry, Genetics and Molecular Biology (65,3%) Pharmacology, Toxicology and Pharmaceutics (63,6%) General (58,3%) 8 Medicine (60,8%) M di i (60 8%) Neuroscience (64,8%) Chemistry (55,4%) 7 Health Professions (56,4%) Nursing (53,5%) Chemical Engineering (51,6%) 6 Materials Science (52,6%) Dentistry  (55,9%) 5 Energy (42,1%) Physics and Astronomy (47,3%) Veterinary (47,9%) 4 Agricultural and Biological Sciences (45,0%) Environmental Science (43,5%) Engineering (38,7%) 3 Psychology (44,8%) Earth and Planetary Sciences (41,3%) Computer Science (33,7%) 2 Mathematics (32,5%) Decision Sciences (32,4%) Economics, Econometrics and Finance (29,0%) 1 Business, Management  and Accounting (27,7%) , g g( , ) Social Sciences (20,1%) 0 Arts and Humanities  (10,1%) 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 Source: Felix de Moya
  8. 8. SJR and SNIP snippets… SCImago Journal Rank – SJR • Developed by SCImago – Felix de Moya SCImago research group Moya, Consejo Superior de Investigaciones Científicas (CSIC), University of Granada, • Main feature: prestige metric – similar to Google PageRank • Citations are weighted depending on the status of the source they come from • Secondary feature : different citation behaviour addressed Source-Normalized So rce Normali ed Impact per Paper – SNIP • Developed by Henk Moed, CWTS, University of Leiden • Main feature: contextual citation impact • Part 1 – evens out differences in likelihood of citation (i.e. different behaviours) • Part 2 – evens out differences in database coverage in subject fields
  9. 9. SCImago Journal Rank - SJR SJR is a prestige metric – citations weighted depending on where they come from - A journal transfers its prestige by citing - Prestige transferred = journal’s SJR e.g. e g Lancet SJR 2007 = 1.541 – high prestige 1 541 e.g. Scandinavian Journal of Medicine and Science in Sports SJR 2007 = 0.153 – lower prestige A journal’s prestige is shared equally between its citations Life Sciences journal Arts & Humanities journal Normalize for differences in • Hi h impact, llots of citations High i t t f it ti citation behaviour it ti b h i • Low impact, few of citations • One citation = low value between subject fields • One citation = high value
  10. 10. Source Normalized Impact per Paper - SNIP Calculate ‘Citation Potential’ for 2009 1. Collect papers citing 1-3 year old papers 2. Collect reference lists of citing papers in target journal in 2009 Etc. 3. Count number of references in citing papers to any (in any journal) 1-3 year old papers 4. Citation Potential = average number of references to any 1-3 year old papers Etc. Normalize for SNIP = 2009 Impact / 2009 Citation Potential differences in • Life Sciences – high impact high Citation Potential impact, citation behaviour it ti b h i • Arts & Humanities – low impact, low Citation Potential between subject fields
  11. 11. Metrics to Support User Needs Need N d SJR SNIP Manipulation-proof All journals have a metric Fair to database coverage Metrics M i are current Database transparency Rank journals without Impact Factors R kj l ith t I tF t Metric transparency Fair to ll bj t fields F i t all subject fi ld Flexible ranking
  12. 12. First Scopus, and then… SJR and SNIP will be launched in Scopus on 23 January 2010 All 18,000 journals, proceedings and book series receive SJR and SNIP values SJR and SNIP for 2009 go back to 1999 Refreshed twice per y p year: April and September p p New titles will have SJR and SNIP in their second year of coverage Freely available via the Scopus Info site
  13. 13. First Scopus, and then…
  14. 14. Available for Non-users of Scopus 14
  15. 15. We are asking users to change their mindset Launch 23 January 2010 All journals, book series, proceedings All years, 1999-2009 y , Note – 2009 Impact Factor will be published June 2010 Metrics refresh 2010 September 2011 and ongoing April, September Refresh what? All years recalculated to reflect retrospective changes in dynamic database Historical values archived on Info site New titles rule: if data are available, metric will be calculated If title covered from 2010, first metrics published in April 2011 Note – first Impact Factor for new launch would be 2011, published June 2012, 2011 2012 Note – first Impact Factor for newly indexed but established title would be 2012, published June 2013
  16. 16. Information available Access all SNIP & SJR values @ www journalmetrics com Additional Resources: • Research Trends Special Issue on Journal performance Indicators [] (p t and online (print a d o e at ) • Press Release • • Info Site Scopus [ ]