Class notes mixed anova

5 important questions on Class notes mixed anova

When do you use a mixed design anova?

  • When 1 independent variable uses the same participants
  • and another independent variable uses different participants

What does an interaction effect mean, example women and men on aggression after coffee.

It means that one group is more affected by the coffee than the other which could be not affected at all.

What are the assumptions of the mixed anova?

  • Normality: scores on the dependent variable need to be normal per group
  • level of measurement: categorical independent variables, and continuous dependent variables
  • sphericity
  • independence
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How to run a mixed anova in spss?

  1. Analyze; General Linear Models; Repeated Measures
  2. put the repeated independent factor in and name it condition
  3. put the between independent factor in and name it group or just name it
  4. define conditions
  5. model: full factorial
  6. options: main effects of all independent plus interaction
  7. if hypotheses: check contrasts and put repeated on this hypothised variable
  8. making plots is optional

With a mixed anova, what do you do when the assumption of sphericity is not met?

Check wheither the assumption of equal covariances is met, if so you can continue

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