> > Dear freesurfer experts
> >
> In qdec I use the DODS degsin to obtain the thickness difference between my
> two groups with age ,gender as nuisance.Then I want to get the effect size
> map instead of report the significance level. In freesurfer wiki I found that
> we can obtain the effect size map via gamma/sqrt(gammavar*Npilot), where
> Npilot is the number subjects in the pilot study.While I have two groups,one
> control group with 25 subjects and one patient group with 25 subjects too,I
> doubt that which number I should use ,the number of patient group subjects 25
> or for the whole subjects across groups 50 to repalce the Npilot in the
> equation?
And then I look for previous relevant topic in the freesurfer mail list,
found that doug suggested that we can get the effect size just use gamma/rstd,
I tried for that but found completely different result between I use the
equation of gamma/sqrt(gammavar*Npilot), which equation should I use for I want
to get the Cohen'd effect size map?
Thank you in advance for your helps!
Ji Chen_______________________________________________
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