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VOSviewer and CitNetExplorer
Tutorial
Nees Jan van Eck and Ludo Waltman
Centre for Science and Technology Studies (CWTS), ...
Centre for Science and Technology
Studies (CWTS)
• Research center of Leiden
University in quantitative
studies of science...
Introduction
2
Bibliometric mapping of science
• Bibliometrics is the scientific field that
quantitatively studies all kinds of bibliograph...
Aim of bibliometric maps
• To provide an overview of the structure of the
scientific literature in a certain domain or on a...
Types of bibliometric maps
• Co-authorship maps of
– authors / organizations
• Co-citation maps of
– publications / journa...
Bibliographic databases
• Contain metadata about publications and their
citing publications
• Examples:
– Thomson Reuters’...
Bibliometric networks
7
Web of
Science
Scopus
Citation network
of publications
Co-authorship network
of authors / organiza...
Software
tools
8
Bibliometric networks in VOSviewer
9
Web of
Science
Scopus
Citation network
of publications
Co-authorship network
of autho...
VOSviewer
10
11
VOSviewer: Overview
• Web of Science, Scopus, and PubMed support
• Text mining techniques
• Advanced mapping and cluste...
Bibliometric networks in CitNetExplorer
12
Web of
Science
Scopus
Citation network
of publications
Co-authorship network
of...
CitNetExplorer
13
CitNetExplorer: Overview
• Citation networks can be constructed directly based
on data downloaded from Web of Science
• Ve...
• Any type of bibliometric
network
• Co-citation and bibliographic
coupling of publications
• Time dimension is ignored
• ...
Assignments
16
Assignments
1. Downloading data from Web of Science
2. Creating term maps using VOSviewer
3. Creating co-citation, bibliog...
Data collection:
Downloading
Web of
Science data
18
Downloading Web of Science data
Pay attention to the following:
• Use the Web of Science Core Collection database
• Use th...
Demonstration + assignment 1
20
Term maps
21
Term map of social science research
on global environmental change
22
Source: www.worldsocialscience.org/activities/world-...
Interpretation of a term map
• The larger a term, the higher the frequency of
occurrence of the term
• In general, the sma...
Demonstration + assignment 2
24
Co-citation and
bibliographic
coupling
maps
25
Determining relatedness based on
citation data
• How to determine the relatedness of publications,
journals, authors, etc....
Bibliographic coupling network of
publications
27
P1
P2
P3
P4
P5
P6
P1
P2
P3
P4
P5
P6
2
1
1
1
Citation network
Bibliograph...
Matrix representation of bibliographic
coupling network
28
P1
P2
P3
P4
P5
P6
2
1
1
1
P1 P2 P3 P4 P5 P6
P1 1 1 0 0 0
P2 1 1...
Co-citation network of publications
29
P1
P2
P3
P4
P5
P6
P1
P2
P3
P4
P5
P6
2
1
1
1
Citation network
Co-citation
network
Matrix representation of co-citation
network
P1 P2 P3 P4 P5 P6
P1 0 0 0 0 0
P2 0 0 1 0 0
P3 0 0 0 0 0
P4 0 1 0 1 1
P5 0 0 ...
Co-citation map of journals
31
Co-authorship
maps
32
Co-authorship map of authors
33
Demonstration + assignment 3
34
CitNetExplorer
35
Why use CitNetExplorer?
• To analyze the structure and development of a
research field
– Example: Identifying the main top...
Demonstration + assignment 4
37
More
information
38
Websites
39
www.vosviewer.com www.citnetexplorer.nl
Publications on VOSviewer
• Van Eck, N.J., & Waltman, L. (2014). Visualizing bibliometric networks. In Y.
Ding, R. Roussea...
Publications on CitNetExplorer
• Van Eck, N.J., & Waltman, L. (2014). CitNetExplorer: A new software tool for
analyzing an...
Course: Bibliometric Network Analysis
and Science Mapping
• April 12-13, 2016
• Leiden University, The Netherlands
• Parti...
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VOSviewer and CitNetExplorer Tutorial

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This tutorial deals with two software tools: VOSviewer and CitNetExplorer. VOSviewer (www.vosviewer.com) is a freely available tool for constructing and visualizing bibliographic coupling, co-citation, co-authorship, and term co-occurrence networks. These networks can be constructed based on data downloaded from Web of Science or Scopus. CitNetExplorer (www.citnetexplorer.nl) is a freely available tool for analyzing and visualizing citation networks of publications.

The aim of the tutorial is to provide the participants with a basic knowledge of VOSviewer and CitNetExplorer. Given time constraints, it will not be possible to explore the two tools in a fully comprehensive way, but the tutorial will offer a thorough introduction into the most essential features of the tools. This should be sufficient for the participants to perform all basic analyses that can be done using VOSviewer and CitNetExplorer. In addition, it should allow the participants to independently explore the tools in more detail.

The lecturers are Nees Jan van Eck and Ludo Waltman, both affiliated to the Centre for Science and Technology Studies (CWTS) of Leiden University. Nees Jan and Ludo are the developers and VOSviewer and CitNetExplorer, and they therefore have an in-depth knowledge of both software tools. Nees Jan and Ludo regularly organize courses and workshops on VOSviewer and CitNetExplorer (see for instance www.cwts.nl/Bibliometric-Network-Analysis-and-Science-Mapping-Using-VOSviewer), so they have a lot of experience in training people in the use of these tools.

Published in: Science

VOSviewer and CitNetExplorer Tutorial

  1. 1. VOSviewer and CitNetExplorer Tutorial Nees Jan van Eck and Ludo Waltman Centre for Science and Technology Studies (CWTS), Leiden University 15th International Conference on Scientometrics & Informetrics Istanbul, Turkey, June 29, 2015
  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. Introduction 2
  4. 4. 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 3
  5. 5. 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 4
  6. 6. 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 5
  7. 7. Bibliographic databases • Contain metadata about publications and their citing publications • Examples: – Thomson Reuters’ Web of Science – Elsevier’s Scopus – MEDLINE 6 – Authors – Affiliations – Source – Volume – Issue – Pages – Publications year – DOI – Title – Abstract – Keywords – Document type – Cited references
  8. 8. Bibliometric networks 7 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
  9. 9. Software tools 8
  10. 10. Bibliometric networks in VOSviewer 9 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
  11. 11. VOSviewer 10
  12. 12. 11 VOSviewer: Overview • Web of Science, Scopus, and PubMed support • Text mining techniques • Advanced mapping and clustering techniques • Advanced visualizations: – Smart labeling algorithm – Overlay visualizations – Density visualizations • Over 100 scientific publications using VOSviewer have been published
  13. 13. Bibliometric networks in CitNetExplorer 12 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
  14. 14. CitNetExplorer 13
  15. 15. CitNetExplorer: Overview • Citation networks can be constructed directly based on data downloaded from Web of Science • Very large citation networks can be handled, with millions of publications and tens of millions of citation relations • Interactive functionality for drilling down into a citation network • Various analysis techniques are available, including clustering of publications based on citation relations 14
  16. 16. • 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 15 VOSviewer CitNetExplorer
  17. 17. Assignments 16
  18. 18. Assignments 1. Downloading data from Web of Science 2. Creating term maps using VOSviewer 3. Creating co-citation, bibliographic coupling, and co-authorship maps using VOSviewer 4. Analyzing citation networks of publications using CitNetExplorer 17
  19. 19. Data collection: Downloading Web of Science data 18
  20. 20. Downloading Web of Science data Pay attention to the following: • Use the Web of Science Core Collection database • Use the Full Record and Cited References option • Use a suitable file format: – VOSviewer supports both the plain text and the tab-delimited format – Tab-delimited files can be easily processed using spreadsheet software • We use the tab-delimited format 19
  21. 21. Demonstration + assignment 1 20
  22. 22. Term maps 21
  23. 23. Term map of social science research on global environmental change 22 Source: www.worldsocialscience.org/activities/world-social-science-report/the-2013-report/read- changing-global-environments/
  24. 24. Interpretation of a term map • The larger a term, the higher the frequency of occurrence of the term • In general, the smaller the distance between two terms, the higher the relatedness of the terms, as measured by co-occurrences • The horizontal and vertical axes have no special meaning; maps can be freely rotated and flipped • Colors indicate clusters of closely related terms 23
  25. 25. Demonstration + assignment 2 24
  26. 26. Co-citation and bibliographic coupling maps 25
  27. 27. Determining relatedness based on citation data • How to determine the relatedness of publications, journals, authors, etc. based on citation data? – Co-citation relations – Bibliographic coupling relations – Direct citation relations (CitNetExplorer) 26
  28. 28. Bibliographic coupling network of publications 27 P1 P2 P3 P4 P5 P6 P1 P2 P3 P4 P5 P6 2 1 1 1 Citation network Bibliographic coupling network
  29. 29. Matrix representation of bibliographic coupling network 28 P1 P2 P3 P4 P5 P6 2 1 1 1 P1 P2 P3 P4 P5 P6 P1 1 1 0 0 0 P2 1 1 2 0 0 P3 1 1 0 0 0 P4 0 2 0 0 0 P5 0 0 0 0 0 P6 0 0 0 0 0
  30. 30. Co-citation network of publications 29 P1 P2 P3 P4 P5 P6 P1 P2 P3 P4 P5 P6 2 1 1 1 Citation network Co-citation network
  31. 31. Matrix representation of co-citation network P1 P2 P3 P4 P5 P6 P1 0 0 0 0 0 P2 0 0 1 0 0 P3 0 0 0 0 0 P4 0 1 0 1 1 P5 0 0 0 1 2 P6 0 0 0 1 2 30 P1 P2 P3 P4 P5 P6 2 1 1 1
  32. 32. Co-citation map of journals 31
  33. 33. Co-authorship maps 32
  34. 34. Co-authorship map of authors 33
  35. 35. Demonstration + assignment 3 34
  36. 36. CitNetExplorer 35
  37. 37. 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 36
  38. 38. Demonstration + assignment 4 37
  39. 39. More information 38
  40. 40. Websites 39 www.vosviewer.com www.citnetexplorer.nl
  41. 41. 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 40
  42. 42. 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 41
  43. 43. Course: Bibliometric Network Analysis and Science Mapping • 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 42

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