[R] sample size for log-rank test with more than 2 groups

Frank E Harrell Jr f.harrell at vanderbilt.edu
Tue Apr 8 13:58:55 CEST 2008

Essioux, Laurent wrote:
> Hi everyone,
> I was wondering whether extension of the current spower function for
> Hmisc were existing?
> My current focus is to calculate sample size based on the log-rank test
> with more than 2 groups (with/without trend)
> Taking into account the loss of follow up and the accrual processes.
> A SPSS library (ART) is existing but can't find anything in R
> Any information is welcome !
> Many thanks
> Laurent

spower only implements the two-sample problem.


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Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

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