Sample Size Estimation in Clinical Research: from ...
Here we only discuss the sample size estimation for two-sided tests. One-sided tests for all cases below are dealt with by changing (1-α/2) to (1-α) in all equations.In observational studies, investigators often can obtain more samples in the control group than in the case group (in case-control studies) or in the unexposed group than in the exposed group (in cohort studies). ................
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