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PSYC 234``
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When do we use Within Subjects ANOVA?
1 categorical IV, 3+ levels, Continuous DV, Same ppts complete every condition
Assumptions for simple within subject ANOVA?
Continuous DV
Dependent levels
Normality (Shapiro-wilk)
Sphericity (Mauchly’s test)
Key statistics?
F, df, p, np squared
Should we be concerned about sphericity?
No. We are using a linear mixed effects model, which does not assume sphericity.
Normality
p > .05 = Normality met ANOV
ANOVA
p < .05 = SIgnificant
Bonferroni
p < .05 = Conditions differ
Disadvantages of within-subjects design?
Fatigue effects
Practice effects
Advantages of within-subjects?
control for individual differences
fewer ppts