Ludo Waltman

Ludo Waltman is Professor of Quantitative Science Studies at Centre for Science and Technology Studies, Leiden University and Scientific director at Centre for Science and Technology Studies, Leiden University

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Blogs

Long-read · Opinion & Commentary

The causal intricacies of studying gender bias in science

A recently published paper on the role of gender in mentorship in science has triggered a lot of debate. In this blog post, Vincent Traag and Ludo Waltman contribute to this debate by emphasizing the importance of understanding the underlying causal mechanisms.

Vincent Traag + 1 other • 10-12-2020

Opinion & Commentary

Publications should be FAIR

Scholarly data sets are increasingly expected to be FAIR (findable, accessible, interoperable, and reusable). To fully realize the benefits of open access to the scholarly literature, Ludo Waltman argues that publications should be FAIR as well.

Ludo Waltman • 26-10-2020

Resources

Systematize information on journal policies and practices - A call to action

Recently the creators of Transpose and the Platform for Responsible Editorial Policies convened an online workshop on infrastructures that provide information on scholarly journals. In this blog post they look back at the workshop and discuss next steps.

Willem Halffman + 4 others • 31-08-2020

CWTS Development

The CWTS Leiden Ranking 2020

At CWTS, we have just released a new edition of our Leiden Ranking. In this post, the core members of the Leiden Ranking team provide a quick update and illustrate some of the insights provided by the ranking.

Ludo Waltman + 6 others • 08-07-2020

Opinion & Commentary

Why openly available abstracts are important — overview of the current state of affairs

Openness of the metadata of scientific articles is increasingly being discussed. In this blog post, Aaron Tay (SMU Libraries, Singapore Management University), Bianca Kramer (Utrecht University Library), and Ludo Waltman (CWTS, Leiden University) discuss the value of openly available abstracts.

Aaron Tay + 2 others • 30-06-2020

Comparing bibliographic data sources: Q&A

Last week CWTS researchers Martijn Visser, Nees Jan van Eck, and Ludo Waltman published the paper 'Large-scale comparison of bibliographic data sources: Scopus, Web of Science, Dimensions, Crossref, and Microsoft Academic'. In this post, the authors answer ten questions about their work.

Martijn Visser + 2 others • 29-05-2020

Science & Society

Delineating COVID-19 and coronavirus research

Many initiatives are keeping track of research on COVID-19 and coronaviruses. These initiatives, while valuable because they allow for fast access to relevant research, pose the question of subject delineation. We analyse here one such initiative, the COVID-19 Open Research Dataset (CORD-19).

Giovanni Colavizza + 5 others • 21-04-2020

Opinion & Commentary

Recommendations to Crossref from a Science Studies Perspective

In a recent talk at a Crossref meeting, Ludo Waltman spoke about open citations and made three recommendations to Crossref.

Ludo Waltman • 21-11-2019

CWTS Development

Mapping science using Microsoft Academic data

This blog post discusses the emergence of new data sources in the field of bibliometrics, and how to use them to map science.

Nees Jan van Eck + 1 other • 28-10-2019