Introduction to sample size determination and power analysis for clinical trials.
The importance of sample size evaluation in clinical trials is reviewed and a general method is presented from which specific equations are derived for sample size determination or the analysis of power for a wide variety os statistical procedures. The method is discussed and illustrated in relation to the t test, tests for proportions, tests of survival time, and tests for correlations as they commonly occur in clinical trials. Most of the specific equations reduce to a simple general form for which tables are presented.
D002986:Clinical Trials as Topic / Q000379:methods*; D012107:Research Design; D012494:Sampling Studies; D013223:Statistics as Topic