Hi all, I wanna do regression analysis on behavior and FA maps with sex, age and sex *age as covariates using randomise. I have designed matrix using Glm. But I¡¯m afraid I have done in a wrong way. I have attached my design. I wonder how to correct it. Thanks a lot and Merry Christmas, Haitao Ge Center for Sectional and Imaging Anatomy Shandong University School of Medicine 44#, West Wenhua Rd. Jinan 250012, Shandong P.R.China