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 ...

Journal of the Royal Statistical Society. Series D (The Statistician), Vol. 41, No. 4 (1992), pp. 389-397 (9 pages) The problem of sample size determination in the context of Bayesian analysis, ...

We present a simple sample-size formula for weighted log-rank statistics applied to clustered survival data with variable cluster sizes and arbitrary treatment assignments within clusters. This ...