On Jan 17, 2012, at 11:37 AM, Matthew Webster <
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> Hello,
> This message is generally a sign that there is an issue with the design/contrast - it's probably best to kill the randomise task here and recheck the design. Alternatively you could try re-running the contrast with a different clustering option than TFCE, but I wouldn't expect the output to have any significant voxels.
>
> Many Regards
>
> Narrgew
>
>> After successfully running TBSS I wanted to investigate group comparisons. I made a design matrix/contrast by using glm_gui. I implemented those files in randomise. The first time I ran it everything seemed to work fine but I realized that my design was flawed. I made a new design and attempted again, but received the following message:
>>
>> randomise options: -i all_FA_skeletonised.nii.gz -o ../../TEST/tbss -m mean_FA_skeleton_mask -d ../../TEST/Test.mat -t ../../TEST/Test.con -n 500 --T2 -V
>> Loading Data:
>> Data loaded
>> 7.79255e+14 permutations required for exhaustive test of t-test 1
>> Doing 500 random permutations
>> Starting permutation 1 (Unpermuted data)
>> Starting permutation 2
>> Warning: tfce has detected a large number of integral steps. This operation may require a great deal of time to complete.
>>
>>
>> Nothing has changed in 3 days. Can someone tell me what might be wrong?
>>
>> Thanks
>> Lou