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

Paul A. Games and John F. Howell

Journal of Educational and Behavioral Statistics, 1976, vol. 1, issue 2, 113-125

Abstract: Three different methods for testing all pairs of yȳ k , - yȳ 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.

Keywords: Multiple Comparisons; Means; Heterogeneous Variances; Unequal Sample Sizes (search for similar items in EconPapers)
Date: 1976
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jedbes:v:1:y:1976:i:2:p:113-125

DOI: 10.3102/10769986001002113

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