Some Comments on the Question Whether Co-Occurrence Data Should Be Normalized

9 Pages Posted: 12 Apr 2007

See all articles by Ludo Waltman

Ludo Waltman

Erasmus University Rotterdam - Faculty of Economics and Business

Nees Jan van Eck

Erasmus University Rotterdam - Erasmus School of Economics

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Date Written: March 28, 2007

Abstract

In a recent paper in the Journal of the American Society for Information Science and Technology, Leydesdorff and Vaughan assert that raw cocitation data should be analyzed directly, without first applying a normalization like the Pearson correlation. In this report, it is argued that there is nothing wrong with the widely adopted practice of normalizing cocitation data. One of the arguments put forward by Leydesdorff and Vaughan turns out to depend crucially on incorrect multidimensional scaling maps that are due to an error in the PROXSCAL program in SPSS.

Keywords: Multidimensional scaling, Author cocitation analysis, Co-occurrence data, Normalization, PROXSCAL, Pearson correlation

Suggested Citation

Waltman, Ludo and van Eck, Nees Jan, Some Comments on the Question Whether Co-Occurrence Data Should Be Normalized (March 28, 2007). ERIM Report Series Reference No. ERS-2007-017-LIS, Available at SSRN: https://ssrn.com/abstract=977100

Ludo Waltman (Contact Author)

Erasmus University Rotterdam - Faculty of Economics and Business ( email )

P.O. Box 1738
3000 DR Rotterdam, NL 3062 PA
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Nees Jan Van Eck

Erasmus University Rotterdam - Erasmus School of Economics ( email )

P.O. Box 1738
3000 DR Rotterdam
Netherlands

HOME PAGE: http://people.few.eur.nl/nvaneck/

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