Statistics review 4: sample size calculations.
Critical Care2002Vol. 6(4), pp. 335–335
Citations Over TimeTop 10% of 2002 papers
Abstract
The present review introduces the notion of statistical power and the hazard of under-powered studies. The problem of how to calculate an ideal sample size is also discussed within the context of factors that affect power, and specific methods for the calculation of sample size are presented for two common scenarios, along with extensions to the simplest case.
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