Nothing
#' @export
kurtosis <-
function (x, na.rm = FALSE)
{
var=function(x,...){mean((x-mean(x,...))^2)}
if (na.rm)
x <- x[!is.na(x)]
sum((x - mean(x))^4)/(length(x) * var(x,na.rm=na.rm)^2) - 3
}
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