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Educational and Psychological Measurement
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The Shape of the Inverse Scree Test for Cluster Analysis

Richard G. Lathrop

California State University, Chico

Janice E. Williams

Oklahoma State University

A Monte Carlo study to determine the shape of the Inverse Scree test with various numbers of true groups and under different conditions of both distribution shape and sample size. Six distributions of 3000 computer "subjects" each and a seventh (Low N) distribution of 1500 computer "subjects" were created using a random number generator. Fifty Ward hierarchical cluster analyses were completed on each distribution and medians and 96% confidence intervals were computed for clustering steps 1 through 8. The results indicated that the graphic Inverse Scree test may be distribution-independent, N-independent, and modestly curvilinear. Inferences for additional studies and guidelines for Scree analysts were presented.

Educational and Psychological Measurement, Vol. 49, No. 4, 827-834 (1989)
DOI: 10.1177/001316448904900406
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