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  1. An Experimental Comparison of Bibliometric Mapping Techniques Nees Jan van Eck, Ludo Waltman, Rommert Dekker Erasmus University Rotterdam, The Netherlands {nvaneck,lwaltman,rdekker}@few.eur.nl Jan van den Berg Delft University of Technology, The Netherlands j.vandenberg@tudelft.nl 10th International Conference on Science and Technology Indicators Vienna, September 18, 2008 1 1 1 1

  2. Bibliometric mapping

  3. Bibliometric mapping

  4. Data sets • Journals in economics, management, and operations research • 2001-2005 • ISI categories: business; business, finance; economics; management; and operations research & management science • 376 journals • Terms in computational intelligence • 2001-2005 • 337 terms

  5. Similarity measures • Other names for the association strength • probabilistic affinity index • proximity index

  6. Mapping techniques • Ordinal MDS in SPSS PROXSCAL • VxOrd (DrL) • VxOrd1: top 10 similarities, edge cutting (default settings) • VxOrd2: all similarities, no edge cutting • VxOrd3: top 10 similarities, no edge cutting

  7. Evaluation criteria

  8. MDS – Jaccard index (journals)

  9. VxOrd1 – cosine (journals)

  10. VxOrd2 – cosine (journals)

  11. VxOrd3 – cosine (journals)

  12. VOS – association strength (journals)

  13. Comparison of maps (journals) • MDS clearly performs worst, with no good separation between journals from different fields • As is typical for MDS, journals are located more or less uniformly distributed within a circle • VxOrd3 and VOS perform quite well, with a clear clustering of journals based on their field 13

  14. Robustness and efficiency (journals) • MDS and VxOrd1 have a low robustness and efficiency • The other techniques do much better 14

  15. MDS – Jaccard index (terms)

  16. VxOrd1 – cosine (terms)

  17. VxOrd2 – cosine (terms)

  18. VxOrd3 – cosine (terms)

  19. VOS – association strength (terms)

  20. Comparison of maps (terms) 20

  21. Robustness and efficiency (terms) 21

  22. Conclusions • No complete specification of VxOrd is available in the literature 22