R/expendshares.R

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

#' expendshares
#'
#' Wooldridge Source: Blundell, R., A. Duncan, and K. Pendakur (1998), “Semiparametric Estimation and Consumer Demand,” Journal of Applied Econometrics 13, 435-461. I obtained these data from the Journal of Applied Econometrics data archive at http://qed.econ.queensu.ca/jae/. Data loads lazily.
#'
#' @section Notes: The dependent variables in this data set – the expenditure shares – are necessarily bounded between zero and one. The linear model is at best an approximation, but the usual IV estimator likely gives good estimates of the average partial effects.
#'
#' Used in Text: pages 581-582
#'
#' @docType data
#'
#' @usage data('expendshares')
#'
#' @format A data.frame with 1519 observations on 13 variables:
#' \itemize{
#'  \item \strong{sfood:} share of food expenditures (out of total)
#'  \item \strong{sfuel:} share of fuel expenditures
#'  \item \strong{sclothes:} share of clothing expenditures
#'  \item \strong{salcohol:} share of alcohol expenditures
#'  \item \strong{stransport:} share of transportation expenditures
#'  \item \strong{sother:} share of other expenditures
#'  \item \strong{totexpend:} total expenditure, British pounds per week
#'  \item \strong{income:} family income, British pounds per week
#'  \item \strong{age:} age of household head
#'  \item \strong{kids:} number of children: 1 or 2
#'  \item \strong{ltotexpend:} log(totexpend)
#'  \item \strong{lincome:} log(income)
#'  \item \strong{agesq:} age^2
#' }
#' @source \url{https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041}
#' @examples  str(expendshares)
"expendshares"