Repeated measures ANOVA and adjusted F-tests when sphericity is violated: which procedure is best?

ABSTRACT:

Introduction

One-way repeated measures ANOVA requires sphericity. Research indicates that violation of this assumption has an important impact on Type I error. Although more advanced alternative procedures exist, most classical texts recommend the use of adjusted F-tests, which are frequently employed because they are intuitive, easy to apply, and available in most statistical software. Adjusted F-tests differ in the procedure used to estimate the corrective factor ε, the most common being the Greenhouse-Geisser (F-GG) and Huynh-Feldt (F-HF) adjustments. Although numerous studies have analyzed the robustness of these procedures, the results are inconsistent, thus highlighting the need for further research.

Methods

The aim of this simulation

SUBMITTER: Blanca MJ 

PROVIDER: S-EPMC10499170 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature