Hi AFNI expert,
My experiment had two between-subject variable (One is group: IGD and RGU; One is Glu, which is a continuous variable), two covariates (Sex: Male and female; Headmotion(called FD here) ) and used 3dLME to see their interaction (Group by Glu). The model failed (see the message below). I had no idea how to modify it. Besides, Any suggests are welcomed. Thank you so much!