Reply-To: | | [log in to unmask][log in to unmask] >> > ---------- >> > >> > > -----Original Message----- >> > > From: SPM (Statistical Parametric Mapping) >> > > [mailto:[log in to unmask]] On Behalf Of Matt Shane >> > > Sent: Thursday, December 20, 2007 2:44 PM >> > > To: [log in to unmask] >> > > Subject: Re: [SPM] questions on perfroming 2 x 2 within-subjects >> > > ANOVA in SPM5 >> > > >> > > Dear Will (or anyone else who can help), >> > > >> > > Your reply to Michiru was very timely for me, and I have just >> > > attempted to undertake an analysis guided by your steps below. I >> > > feel like the design matrix is correct, but unfortunately the >> > > contrast manager doesn't appear to be appreciating the >> design I've >> > > created. And so I'm thinking that I might have gone >> astray from your >> > > advice in some manner. >> > > >> > > In short: I have 30 participants in a 3 (Group) x 3 >> > > (TrialType) mixed-model design. I've thus created 3 >> factors in the >> > > flexible-factorial model: Subject, Group and TrialType. >> The design >> > > matrix (which I'm attaching to this >> > > post) appears (to me) to be right: I have 30 subject columns, >> > > followed by the three group columns, followed by the three >> > > trial-type columns, and finally the group x trial type >> interactions. >> > > >> > > My problem arises when I try to create contrasts in the contrast >> > > manager, however: I'm able to create contrasts with the first 30 >> > > 'subject' columns, but I'm told that any contrast utilizing the >> > > 'group' or 'trial type' columns is invalid. Which, obviously, is >> > > problematic since it's the group and trial type that I want to >> > > interrogate! >> > > >> > > Does anyone have any advice? Have I set up my matrix incorrectly? >> > > I'm attaching both the matrix and the .mat file, and >> would be ever >> > > thankful for anyone willing to take the time to look it over. >> > > >> > > Thanks, >> > > Matt >> > > >> > > __________________________ >> > > Matthew S. Shane, Ph.D. >> > > Research Scientist >> > > The MIND Institute >> > > 1101 Yale Blvd NE >&#&í& |