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Dear SPMers, In SPM8, I am trying to run a paired ttest with one covariate - a vector of numbers ranging from 0 to 15.5. Each time I try to run it, I get an error below: Running 'Factorial design specification' Failed 'Factorial design specification' Error using spm_meanby (line 31) row dimension mismatch between inputs In file "E:\kasias\spm8\spm_meanby.m" (v1143), function "spm_meanby" at line 31. In file "E:\kasias\spm8\config\spm_run_factorial_design.m" (v4537), function "spm_run_factorial_design" at line 587. It is surprising, as the vector of covariate is exactly the same length as the number of subjects, and therefore the number of pairs entered into the batch. I saw a couple of emails concering this issue, but non of the solutions are working in my case (restarting SPM, MATLAB, computer did not work). I have already runned a simple regression with this covariate on the scans from one timepoint and it worked perfectly well. The error occurs when I want to compare data from 2 timepoints using paired ttest and including the covariate. Please, let me know how to deal with it. All the best! -- Katarzyna Siuda