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Hi everyone,
I reviewed some of the other answers on the mailing list to compute a
Cohen's d value following the sequence of commands below for a Qdec
Freesurfer analysis:
1) cd glmdir/contrast fscalc gamma.mgh div ../rstd.mgh -o cohensd.mgh
2) mri_segstats --i cohensd.mgh --seg cluster.sig.ocn.mgh --exclude 0
--sum test.output
However, my test.output file looks like:
# ColHeaders Index SegId NVoxels Volume_mm3 StructName Mean StdDev
Min Max Range
1 1 2398 2398.0 Seg0001 4.9611 0.8313 3.6525
7.3172 3.6647
2 2 5893 5893.0 Seg0002 5.1281 1.1535 3.6520
8.8040 5.1520
Why are the mean Cohen's d values (4.9611, 5.1281) so large? Am I
interpreting these incorrectly?
Many thanks in advance for your help,
Josh
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