hi. would anyone be able to instruct me as to how i can generate fitted response curves for a group when task order is counterbalanced? i am able to generate these fitted responses for single subjects and if the task order is the same for all subjects. thanks. Ahmad R. Hariri, Ph.D. Clinical Brain Disorders Branch National Institute of Mental Health 10 Center Drive, Room 4S229 Bethesda, MD 20892-13984 Voice: 301-435-4592 Fax: 301-480-7795