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Large-scale visualization of science

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Presentation at the Data Science seminar at the Faculty of Social and Behavioural Sciences, Leiden University, Leiden, The Netherlands, December 7, 2018.

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Large-scale visualization of science

  1. 1. Large-scale visualization of science Nees Jan van Eck Centre for Science and Technology Studies (CWTS), Leiden University Data Science seminar Faculty of Social and Behavioural Sciences, Leiden University, Leiden December 7, 2018
  2. 2. Centre for Science and Technology Studies (CWTS) • Strong emphasis on bibliometric and scientometric research • Research groups: – Quantitative Science Studies – Science and Evaluation Studies – Science, Technology, and Innovation Studies • Commissioned research for research institutions, funders, governments, companies, etc. 1
  3. 3. CWTS Leiden Ranking 2
  4. 4. Bibliographic data sources 3 PATSTAT
  5. 5. Bibliographic data sources 4 Web of Science Scopus Journals 20,000 24,000 Publications 55 million 45 million Citations 1.2 billion 1.2 billion
  6. 6. Bibliometric networks 5 WoS Scopus Dimensions PubMed Crossref Citation network of pubs / journals / authors / orgs / countries Co-authorship network of authors / orgs / countries Co-citation network of pubs / journals / authors / orgs / countries Co-occurrence network of keywords / terms Bibliographic coupling network of pubs / journals / authors Bibliographic data source
  7. 7. Software tools and techniques 6
  8. 8. VOSviewer 7
  9. 9. Development 8
  10. 10. Users of VOSviewer • Researchers • Research institutions • Research funders • Scientific publishers • Industry 9
  11. 11. Journal citation network based on Crossref data 10 https://www.cwts.nl/blog?article=n-r2r294&title=visualizing-freely-available-citation-data-using-vosviewer
  12. 12. CitNetExplorer 11
  13. 13. Network analysis techniques 12 Layout: • AKA mapping • Visualization of similarities (VOS) Clustering: • AKA community detection • Leiden algorithm
  14. 14. Leiden algorithm 13 Traag et al. (2018)
  15. 15. Algorithmic classification systems of science 14
  16. 16. CWTS publication-level classification system of science • Based on all articles in reviews in Web of Science between 2000 and 2017 • 21.2 million publications • 374.1 million citation links • Classification system of 3 hierarchical levels: – 22 broad disciplines – 868 fields – 4,047 subfields • Computational performance using the Leiden algorithm: less than 2hrs 15
  17. 17. 16 Structure of science based on 4,000 micro-level fields Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering Size of a field is proportional to the number of publications in the field
  18. 18. Publication output of FSW (2010-2016) 17 No. of FSW publications Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  19. 19. Publication output of FSW (2010-2016) 18 No. of FSW publications with ‘data’ in title or abstract Scientometrics
  20. 20. Summary of scientometrics subfield 19 Cluster: 145 No. publications: 16,312 Top 5 terms No. pubs bibliometric analysis 852 impact factor 495 h index 264 peer review 515 citation 642 Top 5 publications No. cits hirsch, je (2005). an index to quantify an individual's scientific research output. p natl acad sci usa, 102(46), 16569-16572. 2,635 wuchty, s; et al. (2007). the increasing dominance of teams in production of knowledge. science, 316(5827), 1036-1039. 699 egghe, l (2006). theory and practise of the g-index. scientometrics, 69(1), 131-152. 609 king, da (2004). the scientific impact of nations. nature, 430(6997), 311-316. 496 newman, mej (2004). coauthorship networks and patterns of scientific collaboration. p natl acad sci usa, 101, 5200-5205. 488 Top 5 authors No. pubs Top 5 journals No. pubs bornmann, l 221 scientometrics 2,865 thelwall, m 202 journal of informetrics 700 leydesdorff, l 175 journal of the american society for information science and technology 613 rousseau, r 161 plos one 339 egghe, l 133 research evaluation 324 Top 5 institutes No. pubs Top 5 departments No. pubs univ granada 316 sch lib & informat sci (indiana univ) 106 kathol univ leuven 256 amsterdam sch commun res ascor (univ amsterdam) 97 leiden univ 249 ctr sci & technol studies (leiden univ) 90 indiana univ 246 sch publ policy (georgia inst technol - atlanta) 88 univ wolverhampton 216 trend res ctr (asia univ) 84 0 200 400 600 800 1,000 1,200 1,400 1,600 2000 2002 2004 2006 2008 2010 2012 2014 2016 No.publications
  21. 21. Publications in scientometrics field 20
  22. 22. Term map of scientometrics field 21 Peer review, OA, careers, and gender Collaboration Scientometric indicators and networks Medical research Country-level analyses
  23. 23. 22 Time-line map of highly cited scientometrics publications
  24. 24. Publication output of FSW (2010-2016) 23 No. of FSW publications with ‘data’ in title or abstract Cognitive control Psychometrics Personality disorder Childhood adversity, adoption Scientometrics
  25. 25. Thank you for your attention! 24
  26. 26. Term map of cognitive control 25
  27. 27. Term map of childhood adversity/adoption 26
  28. 28. Term map of personality disorder 27
  29. 29. Term map of psychometrics 28

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