Dear listers,
I am doing two diffent studies, using Stata 11. The first is a cross-sectional study (n=42,298), the second a case-control study (n1=4,851/n2=4,851).
I am looking at a specific genotype with a frequency of 0.6% in both studies (variable of interest), the endpoint is IHD (Ischemic Heart Disease). I have some difficulties with the power calculations. I want to estimate the minimal value (odds ratio) that can be detected with 80% power for both studies...But what is the right way to do this in Stata? As far as I can tell the sampsi command can+determine power or sample size - not minimal detectable effect size?
Best regards,
Louise Stig Hornstrup, MD, PhD-student
Dept. Clin. Biochem., 4111.
Rigshospitalet, Copenhagen
Denmark
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