Factorial ANOVA: main effects & interactions

Week 9

Concepts

• 2-way factorial experimental designs
• marginal means
• main effects & interaction effects
• factorial ANOVA in R

Required Readings

• Chapter 9—Factorial ANOVA in Answering questions with data by Matthew J. C. Crump
• Chapter 16—Factorial ANOVA in Learning Statistics with R by Danielle Navarro (pdf version). Focus on sections 16.1, 16.2, 16.4, 16.5, 16.6
• read this chapter section in which Maxwell, Delaney, & Kelley discuss the advantages of two-way factorial ANOVA over multiple one-way ANOVAs. It is an excerpt from their excellent textbook: Maxwell SE, Delaney HD, Kelley K (2017) Designing Experiments and Analyzing Data: A Model Comparison Perspective, Third Edition. Routledge. ISBN 9781138892286. The book is beyond the scope of this course, but it is a great resource for those interested in learning more about experimental design and statistical analysis.

Additional supporting materials

• Chapter 10 Lab 10: Factorial ANOVA in Answering questions with data by Matthew J. C. Crump
• Psyc Stats II: Factorial ANOVAs (YouTube video) by Matthew J. C. Crump