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

From: Frank E Harrell Jr <f.harrell_at_vanderbilt.edu>
Date: Tue, 08 Apr 2008 06:58:55 -0500

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

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

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Received on Tue 08 Apr 2008 - 12:03:05 GMT

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