Hi - it's up to you. You don't _need_ to smooth in order for the
randomise stats to be valid (it will be valid either way) - but you
may want to smooth to increase sensitivity to signal whilst
suppressing noise - but don't forget Jones' NeuroImage paper about
the dangers of the arbitrariness of smoothing (or not smoothing also
for that matter) in a standard voxelwise analysis.
Cheers.
On 7 Aug 2006, at 04:10, KL Chen wrote:
> Dear Steve and FSl experts,
> thanks your replay.
> I would like to make sure if I get a correct concept. According to
> Steve's
> replay, could I say if I use randomise tool to do the inference on FA
> image, I should NOT apply any smooth function on it ?
> thank replay
> kl chen
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
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