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 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
