On 17 Jan 2013, at 11:42, SUBSCRIBE FSL Patricia Pires <
[log in to unmask]> wrote:
> Dear fsl list,
>
> i have 4 different groups to analize FA index. I performed a Glm matrix:
>
> /Matrix
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
>
> And their contrasts:
>
> /Matrix
> 1.000000e+00 0.000000e+00 -1.000000e+00 0.000000e+00
> -1.000000e+00 0.000000e+00 1.000000e+00 0.000000e+00
> 1.000000e+00 0.000000e+00 0.000000e+00 -1.000000e+00
> -1.000000e+00 0.000000e+00 0.000000e+00 1.000000e+00
> 1.000000e+00 -1.000000e+00 0.000000e+00 0.000000e+00
> -1.000000e+00 1.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 0.000000e+00 1.000000e+00 -1.000000e+00
> 0.000000e+00 0.000000e+00 -1.000000e+00 1.000000e+00
> 0.000000e+00 -1.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 -1.000000e+00 0.000000e+00
> 0.000000e+00 -1.000000e+00 0.000000e+00 1.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00 -1.000000e+00
>
>
> There are two contrast with significant results when i run randomise:
>
> randomise -i all_FA_skeletonised.nii -m mean_FA_skeleton_mask.nii -o resultados_TBSS -d matriz.mat -t matriz.con -n 5000 --T2 -V
>
> However this procedure has been criticized because there is not a previous overall of results and i am wondering if i first have to do a F-tests:
>
>
http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FEAT/UserGuide#F-Tests
>
> I have to do a F-test first? In that case, what will indicate these results:
>
> - C1: Group A 1 0 0 0
>
> (if i found results here, e.g. cluster --in=resultados_FA_mean_FA_skeleton_mask_tfce_corrp_tstat1.nii.gz --thresh=0.95), would this indicating Group A differ from other groups and then i could finally do my first procedure? Or it is not necessary this first
F-test analysis?
>
> Thanks in advance,
>
> Patricia.