Hello all, I have a 3 x 3 experiment design where I have one control group and eight treatment groups. For one of the dependent variables, brand attitude, I have two measurements – first is before the treatment and second is after the treatment. Within the group, I first need to measure the change in brand attitude before and after exposure to the treatment; then I have to compare two groups with different treatments. What test should I use to understand which treatment has a higher effect on brand attitude?
I fully agree with Vignesh. first thing to do is putting all pre and post as rows, so that you have subjects times 2 cases (and code pre, post: -1, +1).than code the 3 x 3 in 4 dummy-codes (IV1_a, IV1_b (with control 0 on both; same with IV2). yeah?
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