Hello,

I am analyzing a between groups dataset (2 groups) using 3dttest++, and I have what I hope is a quick question regarding setting up the analysis.

I would like to look at a 3-way interaction at the whole brain level of group x age x anxiety scores. If I set up the analysis with setA being one group (e.g., control) and setB being the other group (e.g., experimental), and put into my covariate file a column for age, a column for anxiety score, and an interaction term of age x anxiety score.. would the output sub-brik of Control-Experimental_AgexAnxiety be correctly showing me the 3-way interaction I am interested in testing? Or is there a better way in which to set up such an analysis?

Thanks!
Dominic