R/data-mail_me.R

In OpenIntroStat/openintro: Datasets and Supplemental Functions from 'OpenIntro' Textbooks and Labs

#' Influence of a Good Mood on Helpfulness
#'
#' This study investigated whether finding a coin influenced a person's
#' likelihood of mailing a sealed but addressed letter that appeared to have
#' been accidentally left in a conspicuous place. Several variables were
#' collected during the experiment, including two randomized variables of
#' whether there was a coin to be found and whether the letter already had a
#' stamp on it.
#'
#' The precise context was in a phone booth (this study is from the 1970s!),
#' where a person who entered a phone booth would find a dime in the phone
#' tray, which would be sufficient to pay for their phone call. There was also
#' a letter next to the phone, which sometimes had a stamp on it.
#'
#' @name mail_me
#' @docType data
#' @format A data frame with 42 observations on the following 4 variables.
#' \describe{ \item{stamped}{a factor with levels \code{no} \code{yes}}
#' \item{found_coin}{a factor with levels \code{coin} \code{no_coin}}
#' \item{gender}{a factor with levels \code{female} \code{male}}
#' \item{mailed_letter}{a factor with levels \code{no} \code{yes}} }
#' @source Levin PF, Isen AM. 1975. Studies on the Effect of Feeling Good on
#' Helping. Sociometry 31(1), p141-147.
#' @keywords datasets
#' @examples
#'
#'
#' table(mail_me)
#' (x <- table(mail_me[, c("mailed_letter", "found_coin")]))
#' chisq.test(x)
#'
#' (x <- table(mail_me[, c("mailed_letter", "stamped")]))
#' chisq.test(x)
#'
#' m <- glm(mailed_letter ~ stamped + found_coin + gender,
#'   data = mail_me,
#'   family = binomial
#' )
#' summary(m)
"mail_me"