Hi Anders,
Either don't supply the -e design.grp, or use a design.grp that has a
column of ones (that is, the "group" column in the GUI should be all 1s).
All the best,
Anderson
Am 14.03.14 16:07, schrieb Anders Hougaard:
> Dear all,
>
> I am trying to perform a two-sample test between two groups for a VBM
> study using randomise.
>
> My design is as shown in the attached file, the number of subjects in
> each group is 50, and my input file contains 100 volumes.
>
> I use the following command:
> randomise -i GM_mod_merg_s3.nii.gz -o GM_mod_merg_s3_unpaired -m
> GM_mask.nii.gz -d design_unpaired.mat -t design_unpaired.con -e
> design_unpaired.grp -n 5000 -T
>
> but Randomise only performs 1 permutation per t-test:
>
> Loading Data:
> Data loaded
> 1 permutations required for exhaustive test of t-test 1
> Doing all 1 unique permutations
> Starting permutation 1 (Unpermuted data)
> Critical Value for: GM_mod_merg_s3_unpaired_tfce_corrp_tstat1 is: 16061.5
> 1 permutations required for exhaustive test of t-test 2
> Doing all 1 unique permutations
> Starting permutation 1 (Unpermuted data)
> Critical Value for: GM_mod_merg_s3_unpaired_tfce_corrp_tstat2 is: 7491.47
> 1 permutations required for exhaustive test of t-test 3
> Doing all 1 unique permutations
> Starting permutation 1 (Unpermuted data)
> Critical Value for: GM_mod_merg_s3_unpaired_tfce_corrp_tstat3 is: 1.37897e+07
> 1 permutations required for exhaustive test of t-test 4
> Doing all 1 unique permutations
> Starting permutation 1 (Unpermuted data)
> Critical Value for: GM_mod_merg_s3_unpaired_tfce_corrp_tstat4 is: 1.35278e+07
> Finished, exiting.
>
> What is going wrong here?
>
> All the best,
> Anders
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