Dear all, I have a problem with randomise. I have two groups of patients controls and patients and i want to integrate the age and gender in the matrix. When i run the randomise without these parameters everything goes well. When i use age and gender i have an error type like this: Data loaded > 76 permutations required for exhaustive test of t-test 1 > Doing all 76 unique permutations > Starting permutation 1 (Unpermuted data) > ERROR: Program failed > > An exception has been thrown > Error: tfce requires a positive deltaT input Do u have any idea what i am doing wrong? Thanks in advance