The research question is: which commercial has the highest mean rating? We'll first just inspect the mean ratings in our sample. Although such ratings are strictly ordinal variables, we'll treat them as metric variables under the assumption of equal intervals. She shows the four concepts to 40 participants and asks them to rate each one of them on a 10-point scale, resulting in commercial_ratings.sav. Repeated Measures ANOVA ExampleĪ marketeer wants to launch a new commercial and has four concept versions. Whatever distinguishes these variables (sometimes just the time of measurement) is the within-subjects factor. The simplest repeated measures ANOVA involves 3 outcome variables, all measured on 1 group of cases (often people). Large sample differences, however, are unlikely these suggest that the population means weren't equal after all. If this is true and we inspect a sample from our population, the sample means may differ a little bit. SPSS repeated measures ANOVA tests if the means of 3 or more metric variables are all equal in some population. Running Repeated Measures ANOVA in SPSS.SPSS Repeated Measures ANOVA Tutorial By Ruben Geert van den Berg under ANOVA
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