#' Dataset for Exercise D, Chapter 23
#'
#' Dataset for Exercise D, Chapter 23
#'
#' @format A \code{data.frame} with 19 rows and 2 variables:
#' \describe{
#' \item{pcal}{}
#' \item{bstrength}{}
#' }
#' @source Draper, N.R., Smith, H., (1998) Applied Regression Analyis, 3rd ed., New York: Wiley
#' @examples
#' dse23d
'dse23d'
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