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Statistics for the Social Sciences

Statistics for the Social Sciences. Psychology 340 Fall 2006. Repeated Measures & Mixed Factorial ANOVA. Outline. Basics of repeated measures factorial ANOVA Using SPSS Basics of mixed factorial ANOVA Using SPSS Similar to the between groups factorial ANOVA

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Statistics for the Social Sciences

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  1. Statistics for the Social Sciences Psychology 340 Fall 2006 Repeated Measures & Mixed Factorial ANOVA

  2. Outline • Basics of repeated measures factorial ANOVA • Using SPSS • Basics of mixed factorial ANOVA • Using SPSS • Similar to the between groups factorial ANOVA • Main effects and interactions • Multiple sources for the error terms (different denominators for each main effect)

  3. Example • Suppose that you are interested in how sleep deprivation impacts performance. You test 5 people on two tasks (motor and math) over the course of time without sleep (24 hrs, 36 hrs, and 48 hrs). Dependent variable is number of errors in the tasks. • Both factors are manipulated as within subject variables • Need to conduct a within groups factorial ANOVA

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  6. Example • It has been suggested that pupil size increases during emotional arousal. A researcher presents people with different types of stimuli (designed to elicit different emotions). The researcher examines whether similar effects are demonstrated by men and women. • Type of stimuli was manipulated within subjects • Sex is a between subjects variable • Need to conduct a mixed factorial ANOVA

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