Hi,
> I have a few basic questions for clarification about FEAT post-stats.
>
> 1) At each level of analysis, FEAT gives you tstat.nii.gz and zstat.nii.gz
> in the stat folder. Are
> activations you see in these files not corrected for multiple comparisons?
These t and z-statistic images not p-value images are not even
thresholded, so no they are not corrected for multiple comparisons!
> 2) Do you have to choose either the voxel-wise or cluster-wise
> thresholding in the FEAT post-stats
> tab to have correction applied?
Indeed - that's right.
> 3) Does FEAT give you a zstat.nii.gz file which contain stats that are
> unthreholded but corrected for
> multiple comparisons that we can load onto FSLView and look at activations
> at different thresholds?
yes - you can set the p-value threshold to 1 so that no thresholding is
done - then you can look at the "thresh_zstat" images in conjunction with
the web report tables to see the (GRF-corrected) p-values.
Cheers.
>
> Thank you very much in advance for your information!
>
> -Yoshiko
>
>
|