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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 <dgr...@mgh.harvard.edu> wrote: > > mri_segstats --i P2P3.stack.mgh --seg ocn.mgh --id N --avgwf > P2P3.means-in-clusterN.dat
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