Some Comments on the Question Whether Co-Occurrence Data Should Be Normalized
6 Pages Posted: 9 Apr 2008
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Some Comments on the Question Whether Co-Occurrence Data Should Be Normalized
Date Written: 25 2008 3,
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.
Keywords: co-occurrence data, author cocitation analysis, normalization, Pearson correlation, multidimensional scaling, PROXSCAL
JEL Classification: M11, R4, M, C39
Suggested Citation: Suggested Citation