January 23, 2019. The paper A principled methodology for comparing relatedness measures for clustering publications by Ludo Waltman, Kevin Boyack, Giovanni Colavizza, and Nees Jan van Eck has been published in the arXiv.
January 10, 2019. VOSviewer version 1.6.10 has been released and is available at www.vosviewer.com. More information is available in a blog post.
December 21, 2018. The paper Intermediacy of publications by Lovro Subelj, Ludo Waltman, Vincent Traag, and Nees Jan van Eck has been published in the arXiv.
December 7, 2018. The slides of the presentation that I gave today at the Data Science seminar at the Faculty of Social and Behavioural Sciences of Leiden University in Leiden are available here.
December 5, 2018. The paper Analyzing the activities of visitors of the Leiden Ranking website by Nees Jan van Eck and Ludo Waltman has been published in volume 3, issue 3 of Journal of Data and Information Science.
November 28, 2018. The paper Exploring topics of interest of Mendeley users by Zohreh Zahedi and Nees Jan van Eck has been published in volume 1, issue 1 of Journal of Altmetrics.
November 14, 2018. The paper Framing psychology as a discipline (1950-1999): A large-scale term co-occurrence analysis of scientific literature in psychology by Ivan Flis and Nees Jan van Eck has been published in volume 21, issue 4 of History of Psychology.
November 5, 2018. The paper Analyzing the activities of visitors of the Leiden Ranking website by Nees Jan van Eck and Ludo Waltman has been accepted for publication in Journal of Data and Information Science.
November 7, 2018. The paper Where are the breaks in translation from theory to clinical practice (and back) in addressing depression? An empirical graph-theoretic approach by Greg Siegle1, Angélique Cramer, Nees Jan van Eck, Philip Spinhoven, Steven Hollon, Johan Ormel, Marlene Strege, and Claudi Bockting has been accepted for publication in Psychological Medicine.
October 22, 2018. The paper From Louvain to Leiden: Guaranteeing well-connected communities by Vincent Traag, Ludo Waltman, and Nees Jan van Eck has been published in the arXiv. The paper is also discussed in a blog post. The source code of the Leiden algorithm is available on GitHub.
October 20, 2018. The paper Exploring topics of interest of Mendeley users by Zohreh Zahedi and Nees Jan van Eck has been accepted for publication in Journal of Altmetrics.
September 28, 2018. The slides of the presentation that I gave today at the Colloquium Research Information Systems and Science Classifications: Revisiting the NARCIS Classification in The Hague are available here.
September 4, 2018. The slides of the presentation that I gave today at the Workshop on Open Citations in Bologna are available here.
I am doing research in the field of bibliometrics and scientometrics. My research focuses primarily on the development of visualization tools and algorithms, mainly for analyzing the structure and development of science. I am the main developer of VOSviewer and CitNetExplorer, two well-known software tools for visualizing bibliometric data. The VOSviewer software is frequently used in bibliometric studies. More than 700 publications have appeared in international scientific journals in which the software is employed. In addition to my work on bibliometric visualization, I also focus on the study of bibliometric data sources and the analysis of the full text of scientific publications. In most of my research I am working closely together with Ludo Waltman.
