If you want p-values for the clusters, then you need to run a simulation 
(mri_glmfit-sim). I think QDEC creates a script to do it.

doug

Rosa Steimke wrote:
> dear freesurfer experts. i have another problem in generating output useing 
> mr_surfcluster command. 
>
> i was wondering how to generate an output with the significant clusters from 
> my qdec analysis i learnd that i have to use the mri_surfcluster command and 
> use the sig.mgh file from my qdec. however i am very uncertain about how to 
> apply the explanation (from freesurfer wiki) of the mri_surfcluster commands 
> to the sig.mgh.  i got the error message that the --sum command cannot be 
> used for the sig.mgh file and i dont understand whether i have to apply more 
> commands (besids thresholding, subjects and such) to generate the and output 
> that gives me the size, significant values and coordinates of each of the 
> clusters i can see in qdec. 
>
> thanks for your help. rosa
>   

-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
Phone Number: 617-724-2358 
Fax: 617-726-7422

In order to help us help you, please follow the steps in:
surfer.nmr.mgh.harvard.edu/fswiki/BugReporting


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