Reply-To: | | [log in to unmask][log in to unmask]> > wrote: >> >> Hi Marris, >> >> I saw your settings and noticed that Implicit Mask is set to 'No'. >> I think this should be set to 'Yes.' >> >> If you still see errors, something must be wrong in one or more files >> in your dataset. >> >> I will go through each one of them. >> >> Guillaume and Donald gave a good advice on checking data a few days ago. >> >> https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=spm;501709e8.1504 >> >> <quote> >> >> load SPM.mat >> >> spm_check_registration(SPM.xY.P) >> >> and scroll through your entire dataset. Plotting the globals can also >> give you a hint about suspicious scans: >> >> >> figure, plot(SPM.xGX.rg) >> </quote> >> >> note that spm_check_registration can load up to 24 files. >> Since your dataset is quite large, I think >> >> >> load SPM.mat >> >> figure, plot(SPM.xGX.rg) >> >> will give you some hint. >> >> If you prefer GUI, I recommend using "Check sample homogeneity using >> covariance" function implemented in VBM8 toolbox. It's easy to use and >> quite useful to detect the poor quality data. >> >> >> >> Another concern: I see you set centering on Gender. Basically you >> don't want to center dummy variables such as gender. It's also >> described in VBM tutorial. I would set "No centering" on gender. (and >> probably group if the order of group doesn't mean anything.) >> >> Best regards, >> >> Kiyotaka >> >> >> >> 2015-05-05 13:30 GMT+09:00 Marris Atwood <[log in to unmask]>: >> > Hi Kiyotaka and Indrajeet, >> > >> > Sincere thanks to both of you! Now I understand what I edit should be a >> > setting file instead of SPM.mat. >> > >> > Your pointers on global normalization are very enlightening. Yet, the >> > strange thing is, I am not using "proportional" for global normalization. >> > Instead, I am treating it as a covariate by using "ANCOVA". >> > >> > I have attached my saved settings here. Any guess is very much welcomed >> > and appreciated! >> > >> > Thanks a lot, >> > MA >> > >> > >> >> >> >> -- >> Kiyotaka Nemoto, M.D., Ph.D. >> Assistant Professor >> Department of Psychiatry >> Division of Clinical Medicine, Faculty of Medicine >> University of Tsukuba >> 1-1-1Tennodai Tsukuba, Ibaraki 305-8575, Japan >> E-mail: [log in to unmask]@mail.gmail.com0_0_ |