Nothing
r.cha <- function(x, weight, k, beta){
n <- length(x)
if (is.null(weight)) weight <- rep(1, n)
rhow <- k*weighted.median(x, weight)
ind <- ifelse(x > rhow, 1, 0)
r.cha <- sum(((1-(rhow/(x[x>0]))^beta)*ind[x>0])*weight[x>0])/sum(weight)
return(r.cha)
}
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