Nothing
gini <- function(x, weights=rep(1,length=length(x))){
ox <- order(x)
x <- x[ox]
weights <- weights[ox]/sum(weights)
p <- cumsum(weights)
nu <- cumsum(weights*x)
n <- length(nu)
nu <- nu / nu[n]
sum(nu[-1]*p[-n]) - sum(nu[-n]*p[-1])
}
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