What question did this study set out to answer?

To compare the familywise Type I error rates and statistical power of several stepwise multiple comparison procedures for repeated measures means when assumptions of sphericity and normality are violated.

June 1, 1994Journal of Educational Statistics

Stepwise and Simultaneous Multiple Comparison Procedures of Repeated Measures’ Means

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Authors

HKH. J. KeselmanUniversity of Manitoba

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Implication

Statistical evaluation demonstrates superior statistical power for Welsch's step-up procedure across repeated measures, indicating optimal performance under violated distributional assumptions.

Key Points

To compare the familywise Type I error rates and statistical power of several stepwise multiple comparison procedures for repeated measures means when assumptions of sphericity and normality are violated.
Evaluated stepwise multiple comparison procedures based on approaches by Hayter, Hochberg, Peritz, Ryan-Welsch, Shaffer, and Welsch.
Assessed familywise error control and robust performance across three definitions of statistical power under violations of multisample sphericity and multivariate normality.
Identified robust stepwise multiple comparison procedures that maintain familywise error control despite violated distributional assumptions.
Welsch's step-up procedure demonstrated the highest average statistical power among all evaluated multiple comparison methods.

Cite This Study

H. J. Keselman (1994) studied this question.

synapsesocial.com/papers/6a0ff595e6385ae0c9fcb85f https://doi.org/10.3102/10769986019002127

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Implication

Statistical evaluation demonstrates superior statistical power for Welsch's step-up procedure across repeated measures, indicating optimal performance under violated distributional assumptions.

Stepwise and Simultaneous Multiple Comparison Procedures of Repeated Measures’ Means

Discussion

Member takes

Implication

Key Points

Cite This Study

Stepwise and Simultaneous Multiple Comparison Procedures of Repeated Measures’ Means

Discussion

Member takes

Implication

Key Points

Cite This Study

Also Consider

Also Consider