[R] equivalence test

[Ross Darnell]

>Hi,
>	is it possible to do an equivalence test on paired quantitative datas 
>in R? Is there a way to calculate sample size for such tests?
>
>I've tried to find some documentation on that subject but I was 
>unsuccessfull. 
>I'll be happy with any links on equivalence test. If such a test does'nt 
>exist in R, i'll do it manually if I find a method to do so.
>
>Best regards
>
>Blaise

The sample size for an equivalence trial with normally distributed
outcomes can be calculated by

n <- 2 * s^2 / delta^2 * (qnorm(alpha/2) + qnorm(beta/2))^2

s = standard deviation
delta = clinically important difference
alpha = Type I error
beta = Type II error


-- 
Ross Darnell