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Hi experts, 

I have extracted the area of the significant cluster with the command like the following:
mri_segstats --i mgh/lh.volume.all.mgh  --seg glmdir_az_vz/lh.volume.all.glmdir/av-group2-vs-group2/cache.th20.neg.sig.ocn.mgh --id 1  --sumwf group1_group2_volume_l.sum-clusters.dat

When I use a t-test for these two group summarized area value, the p value is 0.1398. I did the same process for other significant clusters. However, it is the only one without significant p-value. The detail of the cluster information is listed below. 

# ClusterNo  Max   VtxMax   Size(mm^2)  MNIX   MNIY   MNIZ    CWP    CWPLow    CWPHi   NVtxs    WghtVtx   Annot

   1       -4.773   53922   1279.30    -32.9    8.5   55.3  0.00300  0.00200  0.00400   2126    -5375.69  caudalmiddlefrontal

Could you give me some ideas where I should find the reason? Thanks a lot!

Regards,
Ting 
On Aug 14, 2018, at 10:51 AM, Douglas Greve <dgreve@mgh.harvard.edu> wrote:

mri_segstats --i P2P3.stack.mgh --seg ocn.mgh --id N --avgwf P2P3.means-in-clusterN.dat