Power analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required sample size for ...

An improved approximate formula is derived for determination of the sample sizes required for detecting the difference between two binomial parameters with specified type I and type II errors. Journal ...

Answers to questions concerning adequate sample size in a one-way analysis of variance situation depend on such things as the number of categories to be compared, the levels of risk an experimenter is ...