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