Power and the computation of sample size
A statistical test will not be able to detect a true difference if the sample size is too small compared with the magnitude of the difference. When designing experiments, the experimenter should try to ensure that a sufficient amount of data are collected to be reasonably sure that a difference of a specified size will be detected. R has methods for doing these calculations in the simple cases of comparing means using one- or two-sample t tests and comparing two proportions.
KeywordsPower Calculation Paired Test True Difference Acceptance Region Noncentrality Parameter
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- Altman, D. G. (1991), Practical Statistics for Medical Research, Chapman & Hall, London.Google Scholar