[R] cpower and censoring

[Daniel Brewer]

I would like to do some power estimations for a log-rank two sample test
and cpower seems to fit the bill.  I am getting confused though by the
man page and what the arguments actually mean. I am also not sure
whether cpower takes into account censoring or not.

Could anyone provide a simple example of how I would get the power for a
set control/non-control clinical trial where censoring occurs at an
estimated rate with an estimated drop out rate.

Quite confused about this.

-- 
**************************************************************
Daniel Brewer, Ph.D.

Institute of Cancer Research
Molecular Carcinogenesis
Email: daniel.brewer at icr.ac.uk
**************************************************************

The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP.

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