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Introduction
Import the data set (Alcohol and Self-control Study) and create a data frame
Type of sums of squares in R: A caution!
Why you need to manually set orthogonal contrasts for lm() objects
R's orthogonal contrast functions
How to manually set orthogonal contrasts for lm() objects
Two-way factorial ANOVA using the afex package
Interaction plot using ggplot
Extract the residuals/predicted values
Testing parametric test assumptions
Two-way factorial ANOVA using the lm() function
Extract the residuals/predicted values
Testing parametric test assumptions
Overview of One Way ANOVA
Transition from T Test to ANOVA
Importance of Group Differences in Psychology
Types of Difference Tests
Within-Group and Between-Group Differences
T Test vs. One Way ANOVA
Assumptions for One Way ANOVA
Reading Data in R
Extracting Variables and Group Assignments
Using `aov` Function for ANOVA
Summary of ANOVA Results
Linear Model Function for ANOVA
Type Three Sum of Squares Method
Utilizing `car` Library for Anova Function
Post Hoc Analysis: Tukey HSD
Welch Test for Unequal Variances
Post Hoc Analysis: Games-Howell Test