#' Car Evaluation Data Set
#'
#' Car Evaluation Database was derived from a simple hierarchical decision model
#' originally developed for the demonstration of DEX.
#'
#' @format A data frame with 1728 observations on the following 7 variables.
#' - `buying`
#' - vhigh, high, med, low.
#' - `maint`
#' - vhigh, high, med, low.
#' - `doors`
#' - 2, 3, 4, 5more.
#' - `persons`
#' - 2, 4, more.
#' - `lug_boot`
#' - small, med, big.
#' - `safety`
#' - low, med, high.
#' - `class_value`
#' - unacc, acc, good, vgood
#' @source
#' Marko Bohanec (marko.bohanec '@' ijs.si)
#' Blaz Zupan (blaz.zupan '@' ijs.si)
#' @references
#' M. Bohanec, V. Rajkovic: Expert system for decision making. Sistemica 1(1), pp. 145-157, 1990.)
#' <https://archive.ics.uci.edu/ml/machine-learning-databases/car/car.data>
#' <https://archive.ics.uci.edu/ml/datasets/Car+Evaluation>
"car_eval"
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