Re: [R] Log rank test power calculations

From: Marc Schwartz <>
Date: Thu, 31 Jan 2008 10:41:53 -0600

Daniel Brewer wrote:
> Does anyone have any ideas how I could do a power calculation for a log
> rank test. I would like to know what the suggested sample sizes would
> be to pick a difference when the control to active are in a ratio of 80%
> to 20%.
> Thanks
> Dan

See the cpower() and spower() functions in Frank Harrell's Hmisc package on CRAN.

HTH, Marc Schwartz mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Thu 31 Jan 2008 - 16:50:22 GMT

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