R/charity.R

In JustinMShea/wooldridge: 115 Data Sets from "Introductory Econometrics: A Modern Approach, 7e" by Jeffrey M. Wooldridge

#' charity
#'
#' Wooldridge Source: P.H. Franses and R. Paap (2001), Quantitative Models in Marketing Research. Cambridge: Cambridge University Press. Professor Franses kindly provided the data. Data loads lazily.
#'
#' @section Notes: This data set can be used to illustrate probit and Tobit models, and to study the linear approximations to them.
#'
#' Used in Text: pages 65, 112-113, 266-267, 628
#'
#' @docType data
#'
#' @usage data('charity')
#'
#' @format A data.frame with 4268 observations on 8 variables:
#' \itemize{
#'  \item \strong{respond:} =1 if responded with gift
#'  \item \strong{gift:} amount of gift, Dutch guilders
#'  \item \strong{resplast:} =1 if responded to most recent mailing
#'  \item \strong{weekslast:} number of weeks since last response
#'  \item \strong{propresp:} response rate to mailings
#'  \item \strong{mailsyear:} number of mailings per year
#'  \item \strong{giftlast:} amount of most recent gift
#'  \item \strong{avggift:} average of past gifts
#' }
#' @source \url{https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041}
#' @examples  str(charity)
"charity"