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
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