Hi Mike,
sorry for the delay, I was unavailable for most of yesterday. There's not a way to automatically do it, but it can be done. Eg, if you have two groups (classes) and one continuous variable (eg, age), and you want to test for an interaction between group and age, then you'd set up the fsgd with two groups and one continuous variable and run with DODS. This will give you 4 regressors: (1) Intercept for Group1 (2) Intercept for Group2, (3) Age Slope for Group1, and (4) Age Slope for Group2. The interaction is just the difference between the slopes, so use a contrast of [0 0 1 -1].
doug
Mike Chee wrote:
Dear Bruce and Co.,
I was wondering if there is a way to perform ANOVA on the cortical thickness data; for example evaluating the interaction between age, gender and three (categorical variables) levels of blood pressure? Its not obvious how this might be done using the current interface.
Mike Chee
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