Hi,
Thanks for your answer. I tried randomise in another sample of 80 subjects. As you said, I indeed found a significantly lower FA in females than in males, using the --T2 option and TFCE.
Nevertheless, when I look at age effects in a sample, I don't manage to find any effect, even when I lower my p value to 0.75.
I am doing:
randomise -i all_FA_skeletonised -o tbss -m mean_FA_skeleton_mask -d design.mat -t design.con -n 500 -D --T2 -V
tbss_fill tbss_tfce_corrp_tstat4 0.75 mean_FA tbss_fillfslview mean_FA -b 0,0.6 mean_FA_skeleton -l Green -b 0.2,0.7 tbss_fill -l Red-Yellow
fslview mean_FA -b 0,0.6 mean_FA_skeleton -l Green -b 0.2,0.7 tbss_fill -l Red-Yellow
It really questions me about the sensitivity of TBSS analyses if anyone get an idea ?
Thanks,
Josselin
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