Journal Impact Factors and Other Bibliometric Indicators

1. Journal Impact FactorsandOther Bibliometric Indicators Irma Pasanen Aalto University Library 7.5.2010

2. Visibility and Impact • Visibility • Publication visibility in international databases and search engines • Open Access • Impact • Citations received

3. … in the light of the source data andaccording to its categorization… The coverage of the source data  Scientific disciplines are different in their communication • in doing research (group work or solitary assignments) • in reporting research (publishing channels, writing conventions) • in the use of references (citations) The accuracy and classification of the source data

4. Bibliometrics is looking at publishing using quantitive (statistical and mathematical ) methodologies Pareto principle Bradford´s law of scattering Garfield´s law of concentration Bibliometrics

5. ISI, Scopus and Google Scholar • ISI Thomson Reuters (ISI Web of Science) • Scopus (Elsevier) 2004 – (access through Nell portal) • Google Scholar (beta) ~2005 – (http://scholar.google.com) Discipline-based, e.g. • CiteSeer (primarily computer and information science) http://citeseerx.ist.psu.edu/

6. ISI Web of Science

7. ISI Journal Citation Reports (JCR) IMPACT FACTOR number of citations received in current year by papers published in the journal in the previous two (or five) yearsdivided by number of papers published in the journal in the previous two (or five) years Note: high impacct factor does not equal high quality or superior scientific value

8. ISI Journal Citation Reports (JCR)

10. Scopus

11. Scopus SJR SCImago Journal Rank- Is weighted by the prestige of the journal, thereby ‘leveling the playing field’ among journals- Eliminates manipulation: raise the SJR ranking by being published in more reputable journals- ‘Shares’ a journal’s prestige equally over the total number of citations in that journal- Normalizes for differences in citation behavior between subject fields SNIP Source Normalized Impact per Paper - 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- Calculates without use of a journal’s subject classification to avoid delimitation- Counters any potential for editorial manipulation

12. Applications with ISI and Scopus journal data

13. Hirsch Index A scientist has index h if h of his Np papers have at least h citations each, and the other (Nph) papers have no more than h citations each. • Hirsch index can be used to compare scientists within the same field, but not across disciplines. It can be a useful indicator among scientists who have already published a good number of publications. http://en.wikipedia.org/wiki/Hirsch_number

14. Playing the game • Name(s) and initials • Affiliation(s) • Co-authors • Self-citations • ResearcherID

15. AaltoRAE ISI vs. Scopus Source data matters, however: the importance of journals in the scholarly communication varies. Results of a study in ISI databases showed that e.g. in - Chemistry 91 % - Electron. & electrical engineering 65 % - Robotics 49 % of references were made to documents published in journals

16. Aalto RAE bibliometric analysis Indicators: • Number of papers • Number of fractionalized papers • Citations per paper • Citations per paper with a 2-year citation window • Journal normalized citation score • Normalized journal citation score • Field normalized citation score (Crown Indicator) • Standard field citation score • Percentage of papers above the 95th citation percentile • Vitality (recency of references) • Percentage of self-citations • Percentage of not cited papers during the period • Mean number of countries per paper • Mean number of authors per paper • H-index www.aalto.fi/aaltorae

17. Questions?Thank you !