Hello, <br>I would like to know how to examine an interaction between continuous variables. <br>In SPM, my understanding is that a new interaction regressor, comprised of the product of the two continuous variables of interest, can be coded and entered into the model.<br>
Would this be appropriate for CTA group analysis in FreeSurfer? Is there any difference if I use the old command line method or the QDEC GUI?<br>Thanks,<br>- Jerry<br>