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Hi, All, I am running a 2nd level 2 sample ttest. For 4 out of my 30 comparisons, I have got error message "no active voxel" when just trying to estimate the model. Is it becasue of the statistic power or what? I have one group of 9 subjects, the other group of 11 subjects. All the single subject data are fine. This error message happens no matter I use my batch scripts or GUI. Any suggestions/comments will be very appreciated. Thanks Jin