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#' 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"
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