Nothing
samplesize.r <- function(delta, power=.80, sig.level=.05){
temp <- function(n){
tc <- qt(p=sig.level/2,df=n-2,lower.tail=FALSE)
rc <- sqrt((tc^2)/((tc^2)+(n-2)))
fisher.z <- function(r){(1/2)*log((1+r)/(1-r))}
Zl <- (-fisher.z(rc)-fisher.z(delta))/(1/sqrt(n-3))
Zu <- (fisher.z(rc)-fisher.z(delta))/(1/sqrt(n-3))
return(pnorm(Zl,lower.tail=TRUE) + pnorm(Zu,lower.tail=FALSE)-power)
}
ceiling(uniroot(temp,c(4,10e10))[[1]])
}
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