#' Self-Reported Heights
#' 
#' Self-reported heights in inches for males and females.
#'
#'\itemize{
#'  \item sex. Male or Female.
#'  \item height. Height in inches. 
#' }
#'
#'
#' @docType data
#'
#' @usage data(heights)
#'
#' @format An object of class \code{"data.frame"}. 
#'
#' @keywords datasets
#'
#'
#'
#' @examples
#' data(heights)
#' head(heights)
"heights"
