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Dear Steve, you are setting up your second level model properly but you seem to only have one subject so there isn't much hope there for a random effect analysis... Don't you have data from other subjects? Best regards, Guillaume. Steve Masson wrote: > Dear SPMers, > > I' m trying to learn how to do a paired t-test with SPM8 using the matlabbatch editor and I've got an error message: > > * * * > "Failed 'Results Report' > Error using ==> not > NaN's cannot be converted to logicals. > In file "/Applications/MATLAB_SV74/spm8/spm_P_RF.m" (v3627), function "spm_P_RF" at line 83. > In file "/Applications/MATLAB_SV74/spm8/spm_P.m" (v2690), function "spm_P" at line 48. > In file "/Applications/MATLAB_SV74/spm8/spm_list.m" (v3450), function "spm_list" at line 339. > In file "/Applications/MATLAB_SV74/spm8/config/spm_run_results.m" (v3433), function "spm_run_results" at line 56. > In file "/Applications/MATLAB_SV74/spm8/config/spm_run_results.m" (v3433), function "spm_run_results" at line 26. > > The following modules did not run: > Failed: Results Report" > * * * > > I did a first level analysis and obtain two conxxxx.img (one mesure at t1 (before treatment) and the other for mesure at t2 (after treatment)). > > After, I used the two conxxxx.img images to run a second level analysis paired t-test (see .m file or pictures attached). > > When the job reached the Print Results module, the error message is showed. > > When I display the image spmT_0001.img resulting for the failed analysis, there is simply nothing (see black picture). > > I certainly misspecified something. > > I tried many things and read the archive of the email list but I didn't find a solution or explanation. > > Does somebody can point an error in my procedure or provide an example of how to use the batch editor to do paired t-test? > > Thanks a lot. > > Steve -- Guillaume Flandin, PhD Wellcome Trust Centre for Neuroimaging University College London 12 Queen Square London WC1N 3BG