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. The change will be analysed through a difference-in-difference analysis. 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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