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. Frank > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
