I am conducting a study with a quasi-experiment non-equivalent control group where we are measuring a change (from pre and post-test) in a binary outcome variable between clusters where an intervention has been implemented and clusters where no intervention is implemented. What is the appropriate method to calculate the sample size in Stata? What is the appropriate package to use? I have used power twoproportions 0.23 0.43, m1(10) mratio(1) power(0.8) however this only considers a point at one point in time. Is there another function that I could use?
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