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STIMULATE 5

STIMULATE 5. Ronald Rousseau Web page: users.telenet.be/ronald.rousseau. Citation analysis. Advanced parts Bibliographic coupling Co-citation Citation context analysis The Journal Citation Reports (JCR) Bibliometric indicators. Bibliographic coupling and co-citation.

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STIMULATE 5

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  1. STIMULATE 5 Ronald Rousseau Web page: users.telenet.be/ronald.rousseau

  2. Citation analysis • Advanced parts Bibliographic coupling Co-citation Citation context analysis • The Journal Citation Reports (JCR) Bibliometric indicators

  3. Bibliographic couplingand co-citation

  4. Co-citation network

  5. Co-citation measures

  6. Citation context analysis • Cited documents become symbols for the ideas they contain. • Highly cited documents can be considered as exemplars or concept symbols: illustrations of methods or theories which comprise the essential repertoire of techniques in a specialty.

  7. Citation analysis of scientific journals • The Journal Citation Reports (JCR) • The annual publication of the JCR by ISI (nowadays Thomson-ISI) has led to a whole series of indicators. Of these the journal impact factor is the best known.

  8. The publication – citation table

  9. The ISI impact factor (synchronous)

  10. Mathematical formulas: the general synchronous impact factor (Rousseau, 1988) CIT(Y-2,Y) + CIT(Y-1,Y) IF(Y)= --------------------------------- = IF2(Y) PUB(Y-2) + PUB(Y-1)

  11. Diachronous impact factors

  12. Mathematical formulas: the general diachronous impact factor

  13. The source – item table

  14. Examples of general source-item relations • Scientific journal  (publishes) articles  (receives) citations • Scientific journal  (publishes) issues  (receives) citations • Scientific journal  (publishes) one particular issue  (receives) citations • Congress proceedings  (consists of) articles  (receives) citations • Institute  (publishes) webpages  (receives) inlinks (the institute web impact factor) • Country  (publishes) webpages  (receives) inlinks (from other countries) (country web impact factor) • Fiction author  (writes/publishes) books  (realizes) sales • Country  (publishes) articles in a particular domain  (receives) citations • Journal  (publishes) articles  (receives) citations in one particular journal

  15. Generalized impact factors (Frandsen – Rousseau)

  16. The median impact factor (MIF): a new impact indicator Here TOT denotes the total number of citations received by journal J in the year Y. CPUB(Y-X,Y) denotes the cumulative number of publications in the journal J, during the period [Y-X, Y]. The symbol X denotes the median cited age.

  17. References SOMBATSOMPOP, N., MARKPIN, T., PREMKAMOLNETR, N. (2004), A modified method for calculating the impact factors of journals in ISI Journal Citation Reports: polymer science category in 1997-2001. Scientometrics, 60: 217-235. ROUSSEAU, R. (2005), Median and percentile impact factors: a set of new indicators. Scientometrics, 63: 431-441.

  18. Example: Scientometrics MIF(2003) • TOT(2003) = 1012  TOT/2 = 506 • The median cited age is 6.53 • The number of articles published during these 6.53 years is 591.75 • The 2003 MIF of Scientometrics is 506/591.75 = 0.855 < ISI IF (1.251).

  19. Recent trends Not just the ISI 2-year synchronous impact, but a whole battery of impact factors are used in science evaluation.

  20. What should be the real purpose of research evaluation? The real goal of any form of research evaluation is providing those people and institutions that have the talent and motivations to carry out scientific research, with the best conditions possible under which to do so (Russell-Rousseau, 2002).

  21. Evaluation and scientometric research Budgetary and other kinds of constraints make evaluations necessary for the equitable distribution of resources. The evaluation of short-term strategic research as well as long-term curiosity-driven search for new knowledge demands the same rigorous standards as scientific research itself. For this reason the application of bibliometric and scientometric techniques in research evaluation must keep up with the rapid changes occurring in scientific communication patterns. Information scientists must also constantly improve the theoretical foundation for the construction of output and impact indicators supporting peer review (Russell-Rousseau, 2002)

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