Some comments on the question whether co-occurrence data should be normalized

Authors:
Ludo Waltman;Nees Jan van Eck
Affiliations:
Econometric Institute, Erasmus School of Economics, Erasmus University Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands;Econometric Institute, Erasmus School of Economics, Erasmus University Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands
Venue:
Journal of the American Society for Information Science and Technology
Year:
2007

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On the normalization and visualization of author co-citation data: Salton's Cosine versus the Jaccard index

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Appropriate similarity measures for author co-citation analysis

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Abstract

In a recent article in JASIST, L. Leydesdorff and L. Vaughan (2006) asserted that raw cocitation data should be analyzed directly, without first applying a normalization such as the Pearson correlation. In this communication, 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. © 2007 Wiley Periodicals, Inc.