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Hello to all, I 'm seeking your help again with a flexible factorial design that gives me the following error: Running 'Factorial design specification' Mapping files : ...done Design configuration : Failed 'Factorial design specification' Error using ==> spm_meanby at 31 *row dimension mismatch between inputs* In file "/Users/lauraravasi/Documents/MATLAB/spm8/spm_meanby.m" (v1143), function "spm_meanby" at line 31. In file "/Users/lauraravasi/Documents/MATLAB/spm8/config/spm_run_factorial_design.m" (v4185), function "spm_run_factorial_design" at line 804. The following modules did not run: Failed: Factorial design specification So I'm not sure where my problem comes from as my design is as follows: 10 subjects in total, 2 groups : Group 1 (n=6) and group 2 (n=4) ; Each subject has been scanned 3 times at Time 1, 2 and 3. I would like to see the main effect of the subject and the interaction of group and time, so I wrote main effect 1 and interaction 2 3. I have 30 scans, all with the same origin, voxel size and dimensions... Here is the matrix that I uploaded after having selected all my scans.. Any help will be very welcome... Regards Laura Column 1 Column 2 Column 3 Column 4 1 image Subject Group Time 1 1 1 1 1 1 1 2 1 1 1 3 1 2 1 1 1 2 1 2 1 2 1 3 1 3 1 1 1 3 1 2 1 3 1 3 1 4 1 1 1 4 1 2 1 4 1 3 1 5 1 1 1 5 1 2 1 5 1 3 1 6 1 1 1 6 1 2 1 6 1 3 1 7 2 1 1 7 2 2 1 7 2 3 1 8 2 1 1 8 2 2 1 8 2 3 1 9 2 1 1 9 2 2 1 9 2 3 1 10 2 1 1 10 2 2 1 10 2 3 -- Cordialement, Regards, *Laura Ravasi*