Simple within subject ANOVA

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PSYC 234``

Last updated 1:44 PM on 8/3/26
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9 Terms

1
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When do we use Within Subjects ANOVA?

1 categorical IV, 3+ levels, Continuous DV, Same ppts complete every condition

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Assumptions for simple within subject ANOVA?

  • Continuous DV

  • Dependent levels

  • Normality (Shapiro-wilk)

  • Sphericity (Mauchly’s test)

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Key statistics?

F, df, p, np squared

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Should we be concerned about sphericity?

No. We are using a linear mixed effects model, which does not assume sphericity.

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Normality

p > .05 = Normality met ANOV

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ANOVA

p < .05 = SIgnificant

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Bonferroni

p < .05 = Conditions differ

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Disadvantages of within-subjects design?

  • Fatigue effects

  • Practice effects

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Advantages of within-subjects?

  • control for individual differences

  • fewer ppts