Dear FreeSurfer Experts, In the example here: http://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf1G2V, it describes the testing of the main effects of two continuous variables.
In order to test the interaction effect, I think we can form an interaction term like age x weight as the third covariate, that is, Regressor1: All ones. Codes intercept/mean for Main Regressor2: age for each subject. Codes age slope for Main Regressor3: weight for each subject. Codes weight slope for Main Regressor4: age x weight for each subject. Codes age x weight interaction effect and then specify a contrast [0 0 0 1]? Is that the way to go? Best, Daniel -- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: yung-jui.y...@yale.edu
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