6.3k citations · 8.6k across the 20 of their papers we have counts for
22 papers
Citation importance-aware document representation learning for large-scale science mapping
Zhentao Liang, Nees Jan van Eck, Xuehua Wu +2
Effective science mapping relies on high-quality representations of scientific documents. As an important task in scientometrics and information studies, science mapping is often c…
Which topics are best represented by science maps? An analysis of clustering effectiveness for citation and text similarity networks
Juan Pablo Bascur, Suzan Verberne, Nees Jan van Eck +1
A science map of topics is a visualization that shows topics identified algorithmically based on the bibliographic metadata of scientific publications. In practice not all topics a…
Funding Covid-19 research: Insights from an exploratory analysis using open data infrastructures
Alexis-Michel Mugabushaka, Nees Jan van Eck, Ludo Waltman
To analyse the outcomes of the funding they provide, it is essential for funding agencies to be able to trace the publications resulting from their funding. We study the open avail…
Investigating Disagreement in the Scientific Literature
Wout S. Lamers, Kevin Boyack, Vincent Larivière +4
Disagreement is essential to scientific progress. However, the extent of disagreement in science, its evolution over time, and the fields in which it happens, remains poorly unders…
From Louvain to Leiden: guaranteeing well-connected communities
Vincent Traag, Ludo Waltman, Nees Jan van Eck
Community detection is often used to understand the structure of large and complex networks. One of the most popular algorithms for uncovering community structure is the so-called…
Constructing bibliometric networks: A comparison between full and fractional counting
Antonio Perianes-Rodriguez, Ludo Waltman, Nees Jan van Eck
The analysis of bibliometric networks, such as co-authorship, bibliographic coupling, and co-citation networks, has received a considerable amount of attention. Much less attention…
Clustering scientific publications based on citation relations: A systematic comparison of different methods
Lovro Šubelj, Nees Jan van Eck, Ludo Waltman
Clustering methods are applied regularly in the bibliometric literature to identify research areas or scientific fields. These methods are for instance used to group publications i…
Field-normalized citation impact indicators and the choice of an appropriate counting method
Ludo Waltman, Nees Jan van Eck
Bibliometric studies often rely on field-normalized citation impact indicators in order to make comparisons between scientific fields. We discuss the connection between field norma…
CitNetExplorer: A new software tool for analyzing and visualizing citation networks
Nees Jan van Eck, Ludo Waltman
We present CitNetExplorer, a new software tool for analyzing and visualizing citation networks of scientific publications. CitNetExplorer can for instance be used to study the deve…
A smart local moving algorithm for large-scale modularity-based community detection
Ludo Waltman, Nees Jan van Eck
We introduce a new algorithm for modularity-based community detection in large networks. The algorithm, which we refer to as a smart local moving algorithm, takes advantage of a we…
Citation analysis may severely underestimate the impact of clinical research as compared to basic research
Nees Jan van Eck, Ludo Waltman, Anthony F. J. van Raan +2
Background: Citation analysis has become an important tool for research performance assessment in the medical sciences. However, different areas of medical research may have consid…
Research collaboration and the expanding science grid: Measuring globalization processes worldwide
Robert J. W. Tijssen, Ludo Waltman, Nees Jan van Eck
This paper applies a new model and analytical tool to measure and study contemporary globalization processes in collaborative science - a world in which scientists, scholars, techn…
A new methodology for constructing a publication-level classification system of science
Ludo Waltman, Nees Jan van Eck
Classifying journals or publications into research areas is an essential element of many bibliometric analyses. Classification usually takes place at the level of journals, where t…
The Leiden Ranking 2011/2012: Data collection, indicators, and interpretation
Ludo Waltman, Clara Calero-Medina, Joost Kosten +7
The Leiden Ranking 2011/2012 is a ranking of universities based on bibliometric indicators of publication output, citation impact, and scientific collaboration. The ranking include…
Text mining and visualization using VOSviewer
Nees Jan van Eck, Ludo Waltman
VOSviewer is a computer program for creating, visualizing, and exploring bibliometric maps of science. In this report, the new text mining functionality of VOSviewer is presented.…
The inconsistency of the h-index
Ludo Waltman, Nees Jan van Eck
The h-index is a popular bibliometric indicator for assessing individual scientists. We criticize the h-index from a theoretical point of view. We argue that for the purpose of mea…
Universality of citation distributions revisited
Ludo Waltman, Nees Jan van Eck, Anthony F. J. van Raan
Radicchi, Fortunato, and Castellano [arXiv:0806.0974, PNAS 105(45), 17268] claim that, apart from a scaling factor, all fields of science are characterized by the same citation dis…
A unified approach to mapping and clustering of bibliometric networks
Ludo Waltman, Nees Jan van Eck, Ed C. M. Noyons
In the analysis of bibliometric networks, researchers often use mapping and clustering techniques in a combined fashion. Typically, however, mapping and clustering techniques that…
Towards a new crown indicator: An empirical analysis
Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen +2
We present an empirical comparison between two normalization mechanisms for citation-based indicators of research performance. These mechanisms aim to normalize citation counts for…
The relation between Eigenfactor, audience factor, and influence weight
Ludo Waltman, Nees Jan van Eck
We present a theoretical and empirical analysis of a number of bibliometric indicators of journal performance. We focus on three indicators in particular, namely the Eigenfactor in…
Rivals for the crown: Reply to Opthof and Leydesdorff
Anthony F. J. van Raan, Thed N. van Leeuwen, Martijn S. Visser +2
We reply to the criticism of Opthof and Leydesdorff [arXiv:1002.2769] on the way in which our institute applies journal and field normalizations to citation counts. We point out wh…
Towards a new crown indicator: Some theoretical considerations
Ludo Waltman, Nees Jan van Eck, Thed N. van Leeuwen +2
The crown indicator is a well-known bibliometric indicator of research performance developed by our institute. The indicator aims to normalize citation counts for differences among…