Hello,

I am using 3dttest++ to run a model on one group with two between-subjects covariates (A and B). I have shown that covariate A accounts for activity in my area of interest, but covariate B does not. A reviewer would like a statistical comparison of A > B. I am unsure how to do this in 3dttest+. I thought that I could treat the data as groups and have a different covariate for each, but this does not appear to be allowed in 3dttest. I would prefer not to do an ROI based approach due to the difficulty of selection bias (the activation for covariate A covers a substantially smaller volume than the anatomical ROI would). Any advice would be greatly appreciated.

Thanks,

Ian