Calculating the Statistical Power of the Univariate and the Multivariate Repeated Measures Analyses of Variance for the Single Group Case Under Various Conditions

Abstract

Repeated measures designs find frequent application in behavioral research. Researchers using such designs must choose between the univariate approach and the multivariate approach for a test statistic. The statistical power of these two approaches has been shown to be varyingly different depending upon the structure of the variance-covariance matrix relative to the pattern of mean differences. However, the guidelines for choosing the most powerful test for a given situation have not been well defined. A FORTRAN program is described which calculates the statistical power of the omnibus tests for the univariate and the multivariate approaches to repeated measures in the single group case. Program input, output, applications, and availability are discussed.