On Nov 20, 2010, at 8:31 AM, XINLI LI wrote: > Dear R users: > > How to calculate the sample size with ANCOVA? For example, in a > clinical trial, the correlation between the baseline and one-year follow-up > blood pressure is 0.7, with a standrad devision 15, in order to detect a 10 > difference between baseline and follow-up with a power = 0.9, and alpha = > 0.05? Then, how to calculate the sample size with the correlation of 0.7 > between baseline and follow-up? > > Thanks and regards, > > Xing
See this post from this past July: https://stat.ethz.ch/pipermail/r-help/2010-July/245656.html 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.
