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#  File src/library/stats/R/reorder.factor.R
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reorder.default <- function(x, X, FUN = mean, ..., order = is.ordered(x), decreasing = FALSE)
{
    scores <- tapply(X = X, INDEX = x, FUN = FUN, ...)
    structure((if(order) ordered else factor)(x,
        levels = names(sort(scores, decreasing = decreasing, na.last = TRUE))),
          scores = scores)
}