[R] Power of test

From: Ethan Johnsons <ethan.johnsons_at_gmail.com>
Date: Fri 27 Oct 2006 - 14:12:23 GMT


What would be the R formulae for a two-sided test?

I have a formula for a one-sided test:

powertest <- function(a,m0,m1,n,s){
t1 = -qnorm(1-a)
num = abs(m0-m1) * sqrt(n)
t2 = num/s
pow = pnorm(t1 + t2)
}

Would you pls let me know if you know of?

Thank you,

ej



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