Nothing
CoxShugart <- function(Z,R) {
# m <- lm (z ~ x)
# a <- as.numeric(m$coefficients[1])
# b <- as.numeric(m$coefficients[2])
RR <- mean(R)
ZZ <- mean(Z)
b <- sum((R-RR) * (Z-ZZ))/sum((Z-ZZ)^2)
return(b)
}
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