e-Articles (Chapter 14)
Here are some full-length research articles that illustrate the use of repeated measures ANOVAs. To view any article, simply click on its title. (NOTE: No claim is made that these articles are perfect in all respects. By carefully reviewing them, you will hone your skills at being able both to decipher and to critique statistically-based research reports.)
Consumer-led Mental Health Education for Pharmacy Students
In this study, a one-way repeated measures ANOVA was used to assess possible changes in students' stigma toward schizophrenia and depression. See the portions of the "EVALUATION AND ASSESSMENT" section called "Data Analysis" and "Survey Results," as well as Tables 2 and 3.
Effects of Warm-Up on VerticalJump Performance and Muscle Electrical Activity Using Half-Squats at Low and Moderate Intensity
Illustrates the use of a 2x2 mixed ANOVA. See the sections of the research report called "Experimental design," "Statistical analysis," and "Results." Note the use of eta squared to estimate effect size.
Sodium Bicarbonate Supplementation Prevents Skilled Tennis Performance Decline After a Simulated Match
In this study, the researchers used a two-way ANOVA with repeated measures on both factors. See the portion of the "Methods" section called "Statistical analysis." The "Results" section of the article presents the finding concerning the 2 main effects and the interaction for each of the study's dependent variables.
Letters of Gratitude: Improving Well-Being through Expressive Writing
In this study, a separate 2x4 (group by time) mixed ANOVA was used with each of the dependent variables: happiness, life-satisfaction, and gratitude. ANOVA summary tables are shown, as are graphs of the 2 interactions that were found to be significant. See Tables 2 and 3, as well as Figures 1 and 2. The graphs help to show why certain tests of simple main effects were significant while others were not.
Changes in Weight Loss, Body Composition and Cardiovascular Disease Risk After Altering Macronutrient Distributions During a Regular Exercise Program in Obese Women
Illustrates use of a 6x4 (Group by Time) mixed ANOVA. The researchers paid attention to the sphericity assumption and used the Huynh-Feldt correction when this important assumption seemed untenable. See the final portion of the "Methods" section: "Statistical Analysis."
A Cognitive-Representational Account of Intuitive Moral Judgment: Effects of Typicality and Accessibility
Illustrates use of a 2x8 fully repeated measure ANOVA, with a post hoc investigation including Bonferroni pairwise comparisons and tests of simple main effects. Effect size was estimated via eta squared. See the portions of the "Results" section for Experiment 1 called "Manipulation Checks" and "Typicality Effects."
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Schuyler W. Huck
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