Dear FSL users,
I've performed group ICA and group comparison
using dual regression. The stage 3 statistics I get include
*_tfce_p_tstat*.nii and *tfce_corrp_tstat*.nii maps of (1-p). I'm now a
bit at a loss how to interpret the *_tfce_p_tstat*.nii maps; their
naming suggests they are uncorrected, however dual regression makes use
of permutation testing which would provide multiple comparison
correction. Furthermore, the results are threshold-free cluster enhanced
(tfce), which suppresses stray (and therefore probably false-positive)
significant voxels. I guess this also provides (maybe somewhat informal)
control over the Type 1 error. Should I therefore consider the
*_tfce_p_tstat*.nii outputs as truly uncorrected or do they deserve more
credit?
Best regards,
Rene Besseling
