Scopus Matching WoS with Scopus on a paper by paper basis Intersection 9.4 M Web of Science Papers 1996 – 2006: In Scopus 14.7 M In WoS 10.5 M Overall overlap 59% WoS overlap with Scopus 90% Scopus overlap with WoS 64%
To what extent are citeable documents (articles, letters, notes and reviews) in journals processed for the WoS covered by Scopus?
Scopus coverage of WoS papers increases over time
Incomplete coverage of WoS journals decreases over time % WoS Journals In 2005 82% of WoS journals were completely covered in Scopus In1996 55% of WoS journals were completely covered in Scopus WoS journals not covered by Scopus at all
To what extent are documents in an external file processed for the WoS and/or Scopus?
Coverage differences in a practical case: 2001 RAE papers
Up to 4 publications of every active faculty staff member
Time Period 1994/1996 – 2000
Papers assigned to units of assessment
Only small overall coverage differences Domain Total nr Papers in Wos in Scopus +/- Science 95,056 84.1% 84.4% +0.3 Mathematics 6,634 81.8% 80.1% -1.7 Social Science and Humanities 91,324 24.9% 25.9% +1.0
Coverage differences for Units of Assessments (Sciences)
Cooperation between SCImago and CWTS (Carmen Lopez Illescas )
Comparison between Scopus and Web of Science
Comparison on a journal-by-journal basis
Overlap from a WoS perspective: WoS cancer categories No. WoS journals WoS journals in Scopus Oncology 126 112 (89%) In canc catg 14 (11%) In other catg 0 (0%) Not in Scopus Total no. journals 126
Overlap from a Scopus perspective: Scopus cancer catgs No. Scopus journals In both categs Scopus journals in WoS Oncology 167 75 112 (48%) Canc catgs 13 (6%) Other catgs Cancer Research 139 106 (46%) Not in WoS Total no. journals 231
Characterization of Scopus surplus: Language and Publisher country Data source: Ulrich Journals in WoS and Scopus (n=112) Journals in Scopus but not in WoS (n=106) English language 94% 72% Number of different languages 4 15 Publisher in: USA; UK; Netherlands 78% 51%
Characterization of Scopus surplus: other journal properties Data source: Ulrich Journals in WoS and Scopus (n=112) Journals in Scopus but not in WoS (n=106) Nº % Nº % Started year bet. 1996-2006 17 15.2 57 53.8 Media online free 1 0.9 10 9.4 Refereed 108 96.4 72 67.9 Frequency 12 or more a year 69 61.6 31 29.2
We can clearly conclude that the application of bibliometric techniques, solely based on WoS (but very likely also Scopus) will not be valid for some of the ‘soft’ fields in the social sciences and the humanities.
That is why the tool box has to be extended !
Part II: Bibliometric indicators one encounters in the field
Network of publications (nodes ) linked by citations (edges ) Lower citation-density Higher citation - density e.g., applied research, e.g., basic natural social sciences medical research FCSm JCSm CPP Values for normalization