R/slp75_81.R

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

#' slp75_81
#'
#' Wooldridge Source: See SLEEP75.RAW Data loads lazily.
#'
#' @section 
#'
#' Used in Text: pages 463-464
#'
#' @docType data
#'
#' @usage data('slp75_81')
#'
#' @format A data.frame with 239 observations on 20 variables:
#' \itemize{
#'  \item \strong{age75:} age in 1975
#'  \item \strong{educ75:} years educ in '75
#'  \item \strong{educ81:} years educ in '81
#'  \item \strong{gdhlth75:} = 1 if good hlth in '75
#'  \item \strong{gdhlth81:} =1 if good hlth in '81
#'  \item \strong{male:} =1 if male
#'  \item \strong{marr75:} = 1 if married in '75
#'  \item \strong{marr81:} =1 if married in '81
#'  \item \strong{slpnap75:} mins slp wk, inc naps, '75
#'  \item \strong{slpnap81:} mins slp wk, inc naps, '81
#'  \item \strong{totwrk75:} minutes worked per week, '75
#'  \item \strong{totwrk81:} minutes worked per week, '81
#'  \item \strong{yngkid75:} = 1 if child < 3, '75
#'  \item \strong{yngkid81:} =1 if child < 3, '81
#'  \item \strong{ceduc:} change in educ
#'  \item \strong{cgdhlth:} change in gdhlth
#'  \item \strong{cmarr:} change in marr
#'  \item \strong{cslpnap:} change in slpnap
#'  \item \strong{ctotwrk:} change in totwrk
#'  \item \strong{cyngkid:} change in yngkid
#' }
#' @source \url{https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041}
#' @examples  str(slp75_81)
"slp75_81"