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Visual exploration of scientific literature using
VOSviewer and CitNetExplorer
Nees Jan van Eck
Centre for Science and Tec...
Explosive growth of scientific literature
1
“A new scientific paper is published
every 30 seconds and there are
10,000 upd...
Bibliographic data sources
2
Bibliographic data sources
3
Web of Science Scopus Dimensions
Journals 20,000 25,000 50,000
Publications 60 million 50 mil...
Bibliometric networks
4
WoS
Scopus
Dimensions
MAG
PubMed
Crossref
Citation network
of pubs / journals / authors / orgs / c...
Outline
• Software tools
– VOSviewer
– CitNetExplorer
• Network analysis techniques
• Algorithmically constructed classifi...
VOSviewer
6
Users of VOSviewer
• Researchers
• Research institutions
• Research funders
• Scientific publishers
• Industry
7
8
9
Text mining
10
JOI
Scientometrics
JASIST
Development
11
Types of networks supported by each data source
12
Co-authorship Co-occurrence Citation Bibliographic
coupling
Co-citation...
Data access
13
Download
Interactive querying
14
15
16
17
CitNetExplorer
18
Network analysis
techniques
19
Network analysis techniques
20
Layout:
• AKA mapping
• Visualization of similarities (VOS)
Clustering:
• AKA community det...
VOS
21
Leiden algorithm
22
Algorithmic
classification systems
of science
23
CWTS publication-level classification system of
science
• Based on all articles, reviews, and proceedings papers in Web of...
25
Breakdown of scientific literature into 4,013 subfields
Social sciences
and humanities
Biomedical and
health sciences
L...
Summary of scientometrics subfield
26
Cluster: 108
No. publications: 24,317
Top 5 terms No. pubs
peer review 802
bibliomet...
Publications in scientometrics subfield
27
Term map of scientometrics field
28
Peer review,
careers, and
gender
Networks analysis
and patents
Collaboration
Medical r...
Time-line map of highly cited scientometrics publications
29
30
Overlay visualizations
Social sciences
and humanities
Biomedical and
health sciences
Life and earth
sciences
Mathematic...
31
Time trend
Social sciences
and humanities
Biomedical and
health sciences
Life and earth
sciences
Mathematics and
comput...
32
Time trend
Physical
sciences and
engineering
MicroRNA
Graphene
Summary of graphene subfield
33
Cluster: 14
No. publications: 39,564
Top 5 terms No. pubs
graphene oxide 10,327
epitaxial ...
Leiden University
34
Social sciences
and humanities
Biomedical and
health sciences
Life and earth
sciences
Mathematics and...
China
35
Social sciences
and humanities
Biomedical and
health sciences
Life and earth
sciences
Mathematics and
computer sc...
Coronavirus related research
36
risk analysis
tourism
complex networks /
epidemics
Math./models infectious
deceases
crisis...
Do it yourself!
37
www.vosviewer.com www.citnetexplorer.nl
Course: Visualizing Science Using VOSviewer
• January 26-29, 2021
• 4 half-day online sessions
• Participants are introduc...
Thank you for your attention!
39
Further reading
40
Further reading
41
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Visual exploration of scientific literature using VOSviewer and CitNetExplorer

Presentation at the International Conference on ICT enhanced Social Sciences and Humanities 2020, July 1, 2020.

It is essential for researchers to have an up-to-date understanding of the literature in their research field. However, keeping up with all relevant literature is highly time consuming. Bibliometric visualizations can support this task. These visualizations provide intuitive overviews of the literature in a research field, enabling researchers to obtain a better understanding of the structure and development of a field and to get an impression of the most significant contributions made in the field.

In this talk, I will give an introduction to two software tools for bibliometric visualization: VOSviewer (www.vosviewer.com) and CitNetExplorer (www.citnetexplorer.nl). VOSviewer is a popular tool for visualizing bibliometric networks of publications, authors, journals, and keywords. CitNetExplorer is a tool for the visualization and analysis of citation networks of scientific publications. I will pay special attention to applications of VOSviewer and CitNetExplorer in the social sciences and humanities, focusing in particular on the use of advanced text mining, network analysis, and visualization techniques for analyzing large amounts of textual data.

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Visual exploration of scientific literature using VOSviewer and CitNetExplorer

  1. 1. Visual exploration of scientific literature using VOSviewer and CitNetExplorer Nees Jan van Eck Centre for Science and Technology Studies (CWTS), Leiden University ICTeSSH 2020 Conference July 1, 2020
  2. 2. Explosive growth of scientific literature 1 “A new scientific paper is published every 30 seconds and there are 10,000 updates to PubMed every day” “It is impossible for humans alone to process all of the complex information potentially available to them for the advancement of scientific research” James Chandler, November 2016, BenevolentAI
  3. 3. Bibliographic data sources 2
  4. 4. Bibliographic data sources 3 Web of Science Scopus Dimensions Journals 20,000 25,000 50,000 Publications 60 million 50 million 110 million Citations 1.4 billion 1.5 billion 1.2 billion
  5. 5. Bibliometric networks 4 WoS Scopus Dimensions MAG 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
  6. 6. Outline • Software tools – VOSviewer – CitNetExplorer • Network analysis techniques • Algorithmically constructed classification system of science 5
  7. 7. VOSviewer 6
  8. 8. Users of VOSviewer • Researchers • Research institutions • Research funders • Scientific publishers • Industry 7
  9. 9. 8
  10. 10. 9
  11. 11. Text mining 10 JOI Scientometrics JASIST
  12. 12. Development 11
  13. 13. Types of networks supported by each data source 12 Co-authorship Co-occurrence Citation Bibliographic coupling Co-citation Web of Science      Scopus      Dimensions      PubMed      Crossref      Europe PMC      Microsoft Academic      Semantic Scholar      OCC / COCI      Wikidata     
  14. 14. Data access 13 Download
  15. 15. Interactive querying 14
  16. 16. 15
  17. 17. 16
  18. 18. 17
  19. 19. CitNetExplorer 18
  20. 20. Network analysis techniques 19
  21. 21. Network analysis techniques 20 Layout: • AKA mapping • Visualization of similarities (VOS) Clustering: • AKA community detection • Leiden algorithm
  22. 22. VOS 21
  23. 23. Leiden algorithm 22
  24. 24. Algorithmic classification systems of science 23
  25. 25. CWTS publication-level classification system of science • Based on all articles, reviews, and proceedings papers in Web of Science from the period 2000-2019 • 29.8 million publications • 520.5 million citation links • Classification system of 3 hierarchical levels: – 23 broad disciplines – 805 fields – 4,013 subfields • Computational performance using the Leiden algorithm: less than 2hrs 24
  26. 26. 25 Breakdown of scientific literature into 4,013 subfields Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering Scientometrics Size of a field is proportional to the number of publications in the field
  27. 27. Summary of scientometrics subfield 26 Cluster: 108 No. publications: 24,317 Top 5 terms No. pubs peer review 802 bibliometric analysis 1,563 h index 347 publication 2,255 impact factor 718 Top 5 publications No. cits hirsch, je (2005). an index to quantify an individual's scientific research output. proc nat acad sci usa, 102(46), 16569 3,690 wuchty, s; et al. (2007). the increasing dominance of teams in production of knowledge. science, 316(5827), 1036 995 van eck, nj; et al. (2010). software survey: vosviewer, a computer program for bibliometric mapping. scientometrics, 84(2), 523 988 chen, cm (2006). citespace ii: detecting and visualizing emerging trends and transient patterns in scientific literature. j am soc inf sci technol, 57(3), 359 801 moss-racusin, ca; et al. (2012). science faculty's subtle gender biases favor male students. proc nat acad sci usa, 109(41), 16474 789 Top 5 authors No. pubs Top 5 journals No. pubs bornmann, l 281 scientometrics 3,285 leydesdorff, l 252 proceedings of the international conference on scientometrics and informetrics 1,003 rousseau, r 199 journal of informetrics 837 thelwall, m 164 journal of the american society for information science and technology 576 glanzel, w 154 plos one 424 Top 5 institutes No. pubs Top 5 departments No. pubs leiden univ 382 ctr sci & technol studies (leiden univ) 167 indiana univ 370 ctr sci & technol studies cwts (leiden univ) 149 katholieke univ leuven 354 amsterdam sch commun res ascor (univ amsterdam) 146 univ granada 306 sch informat management (wuhan univ) 144 univ amsterdam 293 sch lib & informat sci (indiana univ) 141 0 500 1,000 1,500 2,000 2,500 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 No.publications
  28. 28. Publications in scientometrics subfield 27
  29. 29. Term map of scientometrics field 28 Peer review, careers, and gender Networks analysis and patents Collaboration Medical research open access Scientometric indicators
  30. 30. Time-line map of highly cited scientometrics publications 29
  31. 31. 30 Overlay visualizations Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  32. 32. 31 Time trend Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  33. 33. 32 Time trend Physical sciences and engineering MicroRNA Graphene
  34. 34. Summary of graphene subfield 33 Cluster: 14 No. publications: 39,564 Top 5 terms No. pubs graphene oxide 10,327 epitaxial graphene 596 bilayer graphene 1,046 graphene field effect transistor 309 Top 5 publications No. cits novoselov, ks; et al. (2004). electric field effect in atomically thin carbon films. science, 306(5696), 666 36,165 geim, ak; et al. (2007). the rise of graphene. nat mater, 6(3), 183 25,419 castro neto, ah; et al. (2009). the electronic properties of graphene. rev mod phys, 81(1), 109 14,462 novoselov, ks; et al. (2005). two-dimensional gas of massless dirac fermions in graphene. nature, 438(7065), 197 13,791 ferrari, ac; et al. (2006). raman spectrum of graphene and graphene layers. phys rev lett, 97(18) 11,432 Top 5 authors No. pubs Top 5 journals No. pubs taniguchi, t 349 physical review b 3,510 watanabe, k 346 carbon 1,772 wang, y 263 applied physics letters 1,676 zhang, y 256 rsc advances 921 peeters, fm 219 nano letters 870 Top 5 institutes No. pubs Top 5 departments No. pubs chinese acad sci 2,023 inst phys (chinese acad sci) 314 russian acad sci 686 sch phys & math sci (nanyang technol univ) 307 tsinghua univ 629 dept phys (natl univ singapore) 287 nanyang technol univ 628 sch phys & astron (univ manchester) 231 peking univ 608 inst ciencia mat madrid (csic) 216 0 1,000 2,000 3,000 4,000 5,000 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 No.publications
  35. 35. Leiden University 34 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  36. 36. China 35 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  37. 37. Coronavirus related research 36 risk analysis tourism complex networks / epidemics Math./models infectious deceases crisis communication / management social media
  38. 38. Do it yourself! 37 www.vosviewer.com www.citnetexplorer.nl
  39. 39. Course: Visualizing Science Using VOSviewer • January 26-29, 2021 • 4 half-day online sessions • Participants are introduced into the main techniques for visualizing science • Special attention is paid to applications in a research evaluation and research management context • The course has an interactive format and the small group size allows participants to practice extensively with the VOSviewer software • www.cwts.nl 38
  40. 40. Thank you for your attention! 39
  41. 41. Further reading 40
  42. 42. Further reading 41

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