Dear all, I struggled to figure out how to derive SD and confidence interval for difference between groups in percentage change from baseline, analyzed in log-transformation. In proc mixed, I have [log(Post) - log(BL)] as response. and treatment as indepent variables, visit, and treatment by visit interaction. So I know, the coefficient beta1 for treatment (and beta0 as intercept), I can transform back to get the percentage change (exp(beta0+beta1) - 1)*100%. However what I am interested in is the difference between the group. [exp(beta0+beta1)-1] - [exp(beta0)-1] = exp(beta0)*(exp(beta1) - 1) How can I derive the SD and CI of the above with the LSmeans output? Any reference I can go to? Many thanks! Carrie
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