Nothing
"gini.mean.diff" <-
function(x) {
x <- sort(x[! is.na(x)])
n <- length(x)
gini <- (2/(n*(n-1)))*sum(x*seq((1-n),(n-1), by=2))
z <- list(gini=gini, L2=gini/2,
source="gini.mean.diff")
return(z)
}
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