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VOSviewer and CitNetExplorer: Software tools for bibliometric analysis of scientific publications

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In this talk, an introduction is given into two software tools that have been developed for bibliometric analysis of scientific publications: VOSviewer (www.vosviewer.com) and CitNetExplorer (www.citnetexplorer.nl). VOSviewer is a popular tool that can be used for visualizing bibliometric networks of citation relations between publications, authors, and journals. In addition, the tool can be used for creating so-called term map visualizations based on a text mining analysis of the titles and abstracts of publications. The most important terms occurring in titles and abstract are identified and the co-occurrence relations between these terms are visualized. CitNetExplorer is a tool for the visualization and analysis of citation networks of scientific publications. The tool can be used to explore in detail how publications build on each other, as indicated by citation links. It is also possible to drill down into specific areas within a citation network, making it possible to perform micro-level analyses of the development of a particular area of research. In this talk, special attention will be paid to possible applications of VOSviewer and CitNetExplorer in humanities research, focusing in particular on the use of advanced text mining, network analysis, and visualization techniques for analyzing large quantities of textual data.

Nees Jan van Eck is a researcher at the Centre for Science and Technology Studies (CWTS) of Leiden University. His research focuses on the quantitative analysis of scientific research based on large amounts of bibliographic data and using sophisticated techniques from fields such as network analysis, statistics, and machine learning. Together with his colleague Ludo Waltman, Nees Jan has developed the VOSviewer and CitNetExplorer tools.

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VOSviewer and CitNetExplorer: Software tools for bibliometric analysis of scientific publications

  1. 1. Nees Jan van Eck Centre for Science and Technology Studies (CWTS), Leiden University DH Colloquium, Digital Humanities Lab, Utrecht University Utrecht, May 7, 2015 VOSviewer and CitNetExplorer: Software tools for bibliometric analysis of scientific publications
  2. 2. Centre for Science and Technology Studies (CWTS) • Research center of Leiden University in quantitative studies of science (bibliometrics and scientometrics) • Bibliometric contract research – Monitoring & evaluation – Advanced analytics – Training & education 1
  3. 3. Short bio • Master in computer science • PhD thesis on bibliometric mapping of science • Since 2009, researcher at Leiden University’s CWTS – Bibliometric network analysis – Bibliometric indicators of research performance 2
  4. 4. Introduction 3
  5. 5. Bibliometric mapping of science • Bibliometrics is the scientific field that quantitatively studies all kinds of bibliographic data • Bibliometric mapping of science is about quantitative methods for visually representing scientific literature based on bibliographic data 4
  6. 6. Aim of bibliometric maps • To provide an overview of the structure of the scientific literature in a certain domain or on a certain topic • Applications: – To identify the main research areas within a scientific field – To get insight into the size of the different areas – To see how the areas relate to each other 5
  7. 7. Types of bibliometric maps • Co-authorship maps of – authors / organizations • Co-citation maps of – publications / journals / authors • Bibliographic coupling maps – publications / journals / authors / organizations • Co-occurrence maps of – keywords / terms extracted from titles and abstracts of articles 6
  8. 8. Bibliographic databases • Contain metadata about publications and their citing publications • Examples: – Thomson Reuters’ Web of Science – Elsevier’s Scopus – PubMed/MEDLINE 7 – Authors – Affiliations – Source – Volume – Issue – Pages – Publications year – DOI – Title – Abstract – Keywords – Document type – Cited references
  9. 9. Bibliometric networks 8 Web of Science Scopus Citation network of publications Co-authorship network of authors / organizations Co-citation network of pubs / authors / journals Co-occurrence network of terms Bibliographic coupling network of pubs / authors / journals Bibliographic database
  10. 10. VOSviewer 9
  11. 11. Bibliometric networks in VOSviewer 10 Web of Science Scopus Citation network of publications Co-authorship network of authors / organizations Co-citation network of pubs / authors / journals Co-occurrence network of terms Bibliographic coupling network of pubs / authors / journals Bibliographic database
  12. 12. VOSviewer 11
  13. 13. 12 VOSviewer • Web of Science, Scopus, and PubMed support • Natural language processing techniques • State-of-the-art mapping and clustering algorithms • Powerful visualizations • Advanced zoom, scroll, and search functionality • Smart label placement algorithm
  14. 14. Bibliometric maps in VOSviewer • Co-authorship maps of – authors / organizations • Co-citation maps of – publications / journals / authors (first author only) • Bibliographic coupling maps – publications / journals / authors / organizations • Co-occurrence maps of – terms extracted from titles and abstracts of articles 13
  15. 15. • 2,667 publications in 3 journals (time period 2009– 2013): – Journal of Informetrics – Journal of the American Society for Information Science and Technology – Scientometrics • Data downloaded from the online version of Web of Science Demo: Creating different bibliometric maps using VOSviewer 14
  16. 16. Term map 15
  17. 17. Co-citation map of journals 16
  18. 18. Co-authorship map of authors 17
  19. 19. DH and term maps: Secondary literature on the history of addiction and addictive substances – Data collected by Lisanne Walma – PubMed database – ((“heroin"[All Fields] OR "morphine"[All Fields] OR "amphetamine"[All Fields] OR "cocaine"[All Fields] OR "cannabis"[All Fields] OR "methamphetamine"[All Fields] OR "narcotic"[All Fields] OR "psychotropic drugs"[All Fields] OR "opium"[All Fields] OR "opioid"[All Fields] OR "methadone"[All Fields] OR "controlled substances"[All Fields]) OR “opiate” [All Fields]) AND "History"[Mesh]) – 2,112 publications (926 with abstract) 18
  20. 20. 19
  21. 21. DH and term maps: Structure and evolution of the field of psychology – In collaboration with Ivan Flis – PsychINFO database – 1950-1959: 25,335 journal articles – 1960-1969: 51,588 journal articles – 1970-1979: 114,639 journal articles 20
  22. 22. 1950-1959 21
  23. 23. 1960-1969 22
  24. 24. 1970-1979 23
  25. 25. CitNetExplorer 24
  26. 26. Bibliometric networks in CitNetExplorer 25 Web of Science Scopus Citation network of publications Co-authorship network of authors / organizations Co-citation network of pubs / authors / journals Co-occurrence network of terms Bibliographic coupling network of pubs / authors / journals Bibliographic database
  27. 27. CitNetExplorer 26
  28. 28. • Any type of bibliometric network • Co-citation and bibliographic coupling of publications • Time dimension is ignored • At most about 10,000 publications are supported • Only citation networks of publications • Direct citations between publications • Time dimension is explicitly considered • Millions of publications are supported 27 VOSviewer CitNetExplorer
  29. 29. Why use CitNetExplorer? • To analyze the structure and development of a research field – Example: Identifying the main topics in the field of scientometrics and tracing the developments within each topic • To delineate a research area – Example: Delineating the literature on science mapping • To study publication oeuvres – Example: Identifying the publications of a researcher and analyzing the influence of cited and citing publications • To support literature reviewing – Example: Reviewing the literature on the h-index 28
  30. 30. • 26,002 publications in 14 journals (time period 1945–2013): • Data downloaded from the online version of Web of Science Demo: Analyzing the structure and development of scientometrics American Documentation ARIST ASLIB Proceedings Information Proc. & Manag. Information Scientist Information Storage & Retrieval Journal of Documentation Journal of Information Science Journal of Informetrics JASIS JASIST Research Evaluation Research Policy Scientometrics 29
  31. 31. 30
  32. 32. 31
  33. 33. 32
  34. 34. 33
  35. 35. 34
  36. 36. Structure of scientometric literature • Citation analysis: – Foundations – Research evaluation – Field normalization – h-index – Journal impact factor • Science mapping • Co-authorship and collaboration • Scientometric laws • Webometrics 35
  37. 37. More information 36
  38. 38. Websites 37 www.vosviewer.com www.citnetexplorer.nl
  39. 39. Publications on VOSviewer • Van Eck, N.J., & Waltman, L. (2014). Visualizing bibliometric networks. In Y. Ding, R. Rousseau, & D. Wolfram (Eds.), Measuring scholarly impact: Methods and practice (pp. 285-320). Springer. 10.1007/978-3-319-10377-8_13 • Van Eck, N.J., & Waltman, L. (2010). Software survey: VOSviewer, a computer program for bibliometric mapping. Scientometrics, 84(2), 523-538. 10.1007/s11192-009-0146-3 • Waltman, L., Van Eck, N.J., & Noyons, E.C.M. (2010). A unified approach to mapping and clustering of bibliometric networks. Journal of Informetrics, 4(4), 629-635. 10.1016/j.joi.2010.07.002 • Van Eck, N.J., Waltman, L., Dekker, R., & Van den Berg, J. (2010). A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS. JASIST, 61(12), 2405-2416. 10.1002/asi.21421 • Waltman, L., & Van Eck, N.J. (2013). A smart local moving algorithm for large- scale modularity-based community detection. European Physical Journal B, 86(11), 471. 10.1140/epjb/e2013-40829-0 38
  40. 40. Publications on CitNetExplorer • Van Eck, N.J., & Waltman, L. (2014). CitNetExplorer: A new software tool for analyzing and visualizing citation networks. Journal of Informetrics, 8(4), 802-823. 10.1016/j.joi.2014.07.006 • Van Eck, N.J., & Waltman, L. (2014). Systematic retrieval of scientific literature based on citation relations: Introducing the CitNetExplorer tool. In Proceedings of the First Workshop on Bibliometric-enhanced Information Retrieval (BIR 2014), pages 13-20. ceur-ws.org/Vol-1143/paper2.pdf 39
  41. 41. Course: Bibliometric Network Analysis and Science Mapping Using VOSviewer • April 12-13, 2016 • Leiden University, The Netherlands • Participants are introduced into the main techniques for bibliometric network analysis and science mapping • Special attention is paid to applications in a research evaluation and science policy context • www.cwts.nl 40
  42. 42. Thank you for your attention! 41

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