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Validating Clusters with the Lower Bound for Sum-of-Squares Error

Published online by Cambridge University Press:  01 January 2025

Douglas Steinley*
Affiliation:
University of Missouri-Columbia
*
Requests for reprints should be sent to Douglas Steinley, Department of Psychological Sciences, University of Missouri-Columbia, 210 McAlester Hall, Columbia, MO 65211, USA. E-mail: steinleyd@missouri.edu.

Abstract

Given that a minor condition holds (e.g., the number of variables is greater than the number of clusters), a nontrivial lower bound for the sum-of-squares error criterion in K-means clustering is derived. By calculating the lower bound for several different situations, a method is developed to determine the adequacy of cluster solution based on the observed sum-of-squares error as compared to the minimum sum-of-squares error.

Information

Type
Original Paper
Copyright
Copyright © 2006 The Psychometric Society

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