ERIC Number: EJ739960
Record Type: Journal
Publication Date: 2006
Effects of Group Size and Lack of Sphericity on the Recovery of Clusters in K-Means Cluster Analysis
de Craen, Saskia; Commandeur, Jacques J. F.; Frank, Laurence E.; Heiser, Willem J.
Multivariate Behavioral Research, v41 n2 p127-145 2006
K-means cluster analysis is known for its tendency to produce spherical and equally sized clusters. To assess the magnitude of these effects, a simulation study was conducted, in which populations were created with varying departures from sphericity and group sizes. An analysis of the recovery of clusters in the samples taken from these populations showed a significant effect of lack of sphericity and group size. This effect was, however, not as large as expected, with still a recovery index of more than 0.5 in the "worst case scenario." An interaction effect between the two data aspects was also found. The decreasing trend in the recovery of clusters for increasing departures from sphericity is different for equal and unequal group sizes.
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Publication Type: Journal Articles; Reports - Evaluative
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