Hi,
The smoothest command can run on either a statistical image or on the residuals, however the former is a less good approximation and so I would use the residuals if you have a choice as it is likely to give you a better estimate of the noise properties.
All the best,
Mark
> On 13 Oct 2017, at 14:42, Wiktor Olszowy <[log in to unmask]> wrote:
>
> Thanks a lot for your reply! So now I use the function 'smoothest' rather than my previous approximations, but I am not sure whether the 'smoothest' function should be applied to 'stats/zstat1' or to 'stats/res4d'. The 'cluster' function should be applied to 'stats/zstat1', I believe. However, now I see that the values in the 'smoothness' file after running a FEAT analysis refer to 'res4d' (even 'VOLUME'!). Now I do not do MNI registration.
>
> Output of 'smoothest -z stats/zstat1 -m mask':
>
> DLH 0.0672294
> VOLUME 172819
> RESELS 68.6703
> FWHMvoxel 4.11247 4.11247 4.11247
> FWHMmm 8.22494 8.64015 7.73045
>
> Output of 'smoothest -d 96 -m mask -r stats/res4d':
>
> DLH 0.178803
> VOLUME 167470
> RESELS 25.9454
> FWHMvoxel 3.03161 3.03161 3.03161
> FWHMmm 6.06322 6.30611 5.42858
>
> The latter output is equal to the output from the usual 'FEAT' analysis. Which 'DLH' and 'VOLUME' values should I take for the 'cluster' function run on 'zstat1'?
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