RE: [R] equivalence test

About this list Date view Thread view Subject view Author view Attachment view

From: Ross Darnell (r.darnell@uq.edu.au)
Date: Fri 27 Jun 2003 - 08:21:01 EST 

Message-id: <he6ca3aq.fsf@uq.edu.au>

>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

______________________________________________
R-help@stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help

About this list Date view Thread view Subject view Author view Attachment view

This archive was generated by hypermail 2.1.3 : Tue 01 Jul 2003 - 09:12:09 EST