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Pairwise Multiple Comparison Procedures with Unequal N’s and/or Variances: A Monte Carlo Study

The Pennsylvania State University

Three different methods for testing all pairs of y_k, - y_k’ were contrasted under varying sample size (n) and variance conditions. With unequal n’s of six and up, only the Behrens-Fisher statistic provided satisfactory control of both the familywise rate of Type I errors and Type I error rate on each contrast. Satisfactory control with unequal n’s of three and up is dubious even with this statistic.

Key Words: Multiple Comparisons • Means • Heterogeneous Variances • Unequal Sample Sizes

Journal of Educational and Behavioral Statistics, Vol. 1, No. 2, 113-125 (1976)
DOI: 10.3102/10769986001002113


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