[R] Sample size with ANCOVA

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 =

Re: [R] Sample size with ANCOVA

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