Ludo Waltman

2024

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To preprint or not to preprint: A global researcher survey.
Rong Ni|Ludo Waltman
Journal of the Association for Information Science and Technology (JASIST) 2024 Volume 75 Issue 6

2021

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Algorithmic labeling in hierarchical classifications of publications: Evaluation of bibliographic fields and term weighting approaches.
Peter Sjögårde|Per Ahlgren|Ludo Waltman
Journal of the Association for Information Science and Technology (JASIST) 2021 Volume 72 Issue 7

2018

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The Closer the Better: Similarity of Publication Pairs at Different Cocitation Levels.
Giovanni Colavizza|Kevin W. Boyack|Nees Jan van Eck|Ludo Waltman
Journal of the Association for Information Science and Technology (JASIST) 2018 Volume 69 Issue 4

2014

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F1000 Recommendations as a Potential New Data Source for Research Evaluation: A Comparison With Citations.
Ludo Waltman|Rodrigo Costas
Journal of the Association for Information Science and Technology (JASIST) 2014 Volume 65 Issue 3

2013

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On the calculation of percentile-based bibliometric indicators.
Ludo Waltman|Michael Schreiber
Journal of the Association for Information Science and Technology (JASIST) 2013 Volume 64 Issue 2

2012

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Universality of citation distributions revisited.
Ludo Waltman|Nees Jan van Eck|Anthony F. J. van Raan
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 1
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The Leiden ranking 2011/2012: Data collection, indicators, and interpretation.
Ludo Waltman|Clara Calero-Medina|Joost Kosten|Ed C. M. Noyons|Robert J. W. Tijssen|Nees Jan van Eck|Thed N. van Leeuwen|Anthony F. J. van Raan|Martijn S. Visser|Paul Wouters
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 12
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A new methodology for constructing a publication-level classification system of science.
Ludo Waltman|Nees Jan van Eck
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 12
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The inconsistency of the h-index.
Ludo Waltman|Nees Jan van Eck
Journal of the Association for Information Science and Technology (JASIST) 2012 Volume 63 Issue 2

2011

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Relations between the shape of a size-frequency distribution and the shape of a rank-frequency distribution.
Leo Egghe|Ludo Waltman
Information Processing and Management 2011 Volume 47 Issue 2

2010

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A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS.
Nees Jan van Eck|Ludo Waltman|Rommert Dekker|Jan van den Berg
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 12
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The relation between Eigenfactor, audience factor, and influence weight.
Ludo Waltman|Nees Jan van Eck
Journal of the Association for Information Science and Technology (JASIST) 2010 Volume 61 Issue 7

2009

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How to normalize cooccurrence data? An analysis of some well-known similarity measures.
Nees Jan van Eck|Ludo Waltman
Journal of the Association for Information Science and Technology (JASIST) 2009 Volume 60 Issue 8

2008

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Appropriate similarity measures for author co-citation analysis.
Nees Jan van Eck|Ludo Waltman
Journal of the Association for Information Science and Technology (JASIST) 2008 Volume 59 Issue 10

2007

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Some comments on the question whether co-occurrence data should be normalized.
Ludo Waltman|Nees Jan van Eck
Journal of the Association for Information Science and Technology (JASIST) 2007 Volume 58 Issue 11