Power analysis for multivariate and repeated measures designs: A flexible approach using the SPSS MANOVA procedure |
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| Authors: | Elizabeth J. D’Amico Torsten B. Neilands Robert Zambarano |
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| Affiliation: | (1) Department of Animal and Plant Sciences, University of Sheffield, Alfred Denny Building, Western Bank, Sheffield, S10 2TN, UK;(2) Department of Psychology, University of Waikato, Private Bag 3105, Hamilton, New Zealand |
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| Abstract: | Although power analysis is an important component in the planning and implementation of research designs, it is often ignored. Computer programs for performing power analysis are available, but most have limitations, particularly for complex multivariate designs. An SPSS procedure is presented that can be used for calculating power for univariate, multivariate, and repeated measures models with and without time-varying and time-constant covariates. Three examples provide a framework for calculating power via this method: an ANCOVA, a MANOVA, and a repeated measures ANOVA with two or more groups. The benefits and limitations of this procedure are discussed. |
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