I conducted an analysis using complex weighted survey data, running both trivariate (stratified bivariate) and stratified logistic regression models. Stratification variable was race. I want to do a post-hoc power analysis to estimate the number of respondents needed to see a hypothetical effect size. I basically want to make sure the population for each race is sufficiently large for analysis. I've never done a power analysis, much less use SAS for it. I've been trying to browse online for details and examples, but I'm still lost. Do I need to use Proc POWER or Proc GLMPower? What exactly is the "dataset" I need to be referring to--the dataset I used for the original analysis, or do I need to create a new dataset--if so, what does that dataset need to include? Any kind of guidelines or suggestions would be greatly appreciated.
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