I am comparing correlations using two different versions of a DV in the same subjects (testing the effect of the DV corrected for volume differences versus the raw DV in a PET neuroimaging analysis). The confidence intervals for the correlations do not overlap and the z-tests are not significant but I'm wondering if they would be in a larger sample. How do I use STATA to run a sample size calculation for a difference in correlation coefficients in the same sample? I found partial info for running it in XLSTAT but I already have STATA and I'd rather not be running analyses in Excel if I can help it. Many thanks!
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