title: How big a sample do you need for the power you want?
authors.forename: N J
authors.initials: NJ
authors.lastname: Andrews
mesh_terms: D016001:Confidence Intervals; D006801:Humans; D008432:Mathematical Computing; D008828:Microbiological Techniques; D011237:Predictive Value of Tests; D012984:Software; D013048:Specimen Handling / Q000706:statistics & numerical data*