Hi SPM experts,
I conducted VBM analysis and applied GLM to estimate the effects of several independent variables (main effects and interaction effect) on the whole-brain gray matter. unfortunately, no cluster survived after FWE or FDR correction. I want to check the effect size for the interaction term. And then conduct a power analysis to estimate the sample size. I wonder how? and what if I do ROI analysis?
Any help would be greatly appreciated. Thank you.
Best,
Dee
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