You want the 95% CI for Cohen's d itself? I don't know how to do that. If  you just want it for the contrast (gamma), then I would just use the formula for a gaussian with mean gamma and stddev sqrt(gammavar)

On 10/5/2019 10:43 AM, Caspar M. Schwiedrzik wrote:

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Hi!

I have an OSGM from a fixed effects group analysis with mri_glmfit. I would like to calculate the effect size and the 95% confidence intervals. I see from various threads on the mailing list that Cohen's d can easily be obtained from the outputs of mri_glmfit by dividing gamma by rstd.

I am wondering now how to compute the 95% CIs for Cohen's d from the outputs of mri_glmfit? 

Thank you very much!

Caspar

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