#' Cut numeric x in quantile
#'
#'
#' Cut numeric x in quantile
#'
#'
#' @param x numeric vector
#' @param n number of quantiles
#' @return A factor vector.
#' @examples
#'
#' tertiles <- xtile(rnorm(1000),3)
#' table(tertiles)
#'
#' @export
xtile <- function(x, n) {
cuts <- quantile(x, probs=seq(0,1,length=n+1))
cut(x, breaks=cuts, include.lowest=TRUE)
}
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