This package contains Rfunctions to perform power calculation in a group sequential clinical trial with censored survival data and possibly unequal patient allocation between treatment and control groups. The fuctions can also be used to determine the study duration in a clinical trial with censored survival data as the sum of the accrual duration, which determines the sample size in a traditional sense, and the followup duration, which more or less controls the number of events to be observed. This package also contains R functions and methods to display the computed results.
Package details 


Author  Emil A. Cornea, Bahjat F. Qaqish, and Joseph G. Ibrahim 
Date of publication  20120702 14:27:34 
Maintainer  Emil A. Cornea <ecornea@live.unc.edu> 
License  GPL2 
Version  1.0 
Package repository  View on CRAN 
Installation 
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