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Educational and Psychological Measurement
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A Priori and a Posteriori Tests of Significance for Koppa

Lyle G. Warner

University of Nevada, Reno

Louis Gray

Washington State University

The tests of significance for koppa presented by Kruskal (1958) for one sample and by Warner and Gray (1973) for two samples are reviewed. The two sample test is extended to include multiple comparisons for both a priori and a posteriori analysis problems. A significant difference between two or more koppa values, within different categories of a third variable, demonstrates an interaction effect. Empirical examples are included.

Educational and Psychological Measurement, Vol. 38, No. 2, 361-376 (1978)
DOI: 10.1177/001316447803800217
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