12. One-Way ANOVA with One Repeated-Measures Factor

Introduction: What Is a Repeated-Measures Design?300
Example: Significant Differences in Investment Size across Time302
 Designing the Study302
 Writing the SAS Program305
 Notes regarding the SAS Program308
 Results from the SAS Output310
 Steps in Interpreting the Output312
 Summarizing the Results of the Analysis314
 Formal Description of Results for a Paper315
Further Notes on Repeated-Measures Analyses315
 Advantages of the Repeated-Measures Design versus the Between-Subjects Design315
 Weaknesses of the One-Way Repeated Measures Design315
 Sequence Effects316
 Validity Conditions for the Univariate One-Way ANOVA, Repeated-Measures Design318
 Alternate Analyses320
Conclusion322
Assumptions Underlying the One-Way ANOVA with One Repeated-Measures Factor322
 Assumptions for the Multivariate Test322
 Assumptions for the Univariate Test323
References324

Overview

This chapter shows how to enter data and prepare SAS programs to perform one-way repeated measures ANOVA using the GLM procedure with the REPEATED statement. This chapter focuses on repeated-measures designs in which each participant is exposed to every condition under the independent variable. This chapter describes the necessary conditions for performing a valid repeated-measures ANOVA, discusses alternative analyses to use when the validity conditions are not met, and reviews strategies for minimizing sequence effects.


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