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Hi Sinan,
Post-hoc power-analyses of that sort are not really meaningful.
By definition, given your null result, if there is an effect present of a
given size, you didn't have sufficient power to detect it.

cheers,
-MH


> Dear FSLers,
>
>
> We compared the GM,  volumetric abnormalities between 3 groups of subjects
> in an ANOVA design using TFCE based thresholding, at .05. However we did
> not find any differences between two of the 3 groups. We are now trying to
> understand if this was due to our sample sizes.
>
> The previous posts on this list were not helpful, probably bec of my level
> of knowledge in statistics.
>
>
> Could you please guide me to do this power analysis ?
>
> Thank you,
>
> Sinan
>