#' @title Transportation Mode Choice by Horowitz (1993)
#'
#' @description A dataset of the transportation mode choice containing
#' 842 observations sampled randomly from Washington, D.C., area
#' transportation study.
#'
#' @docType data
#' @keywords datasets
#' @name transportation
#' @usage transportation
#' @format A data frame with 842 rows and 5 variables. The variables
#' are as follows:
#' \describe{
#' \item{auto}{Transportation mode choice with 1 for automobile and 0 otherwise}
#' \item{dcost}{Transit fare minus automobile travel cost (in dollars)}
#' \item{cars}{Number of cars owned by the traveler's household}
#' \item{dovtt}{Transit out-of-vehicle travel time minus automobile out-of-vehicle travel time (in minutes)}
#' \item{divtt}{Transit in-vehicle travel time minus automobile in-vehicle travel time (in minutes)}
#' }
#' @source The \code{transportation} data were obtained from
#' \emph{Semiparametric estimation of a work-trip mode choice model}
#' by Joel L.Horowitz (1993).
#' \url{https://www.sciencedirect.com/science/article/pii/030440769390113J}.
NULL
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