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#' A data set about car dealers, 4 of 4, to be used in DEA
#'
#' An example dataset with six car dealers to be use in DEA (Data envelopment analysis).
#' @docType data
#' @name cardealers4
#' @keywords data
#' @seealso See also \code{\link{adea-package}}.
#'
#' @section Usage:
#' data('cardealers4')
#'
#' @format
#' \code{Employees}: Number of employees to be considered as input variable in DEA.
#'
#' \code{Depreciation}: Depreciation of stored to be considered as input variable in DEA.
#'
#' \code{Sold}: Number of cars sold as output variable in DEA.
#'
#' \code{Orders}: Number of work orders in garage as output variable in DEA.
#'
#' @details
#' The purpose of this dataframe is to be used in DEA (Data Envelopment Analysis).
#' DEA rate each unit, in this case car dealers, in terms of efficiency.
#' Less input and more output lead to higher efficiency scores.
#'
#' @source
#'\emph{Vicente Coll Serrano y Olga M. Blasco Blasco} (2006)
#' Evaluacion de la eficiencia mediante el analisis envolvente de datos.
#' Electronic edition.
#' \url{https://www.eumed.net/libros-gratis/2006c/197/}
#'
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