#' bwght
#'
#' Wooldridge Source: J. Mullahy (1997), “Instrumental-Variable Estimation of Count Data Models: Applications to Models of Cigarette Smoking Behavior,” Review of Economics and Statistics 79, 596-593. Professor Mullahy kindly provided the data. He obtained them from the 1988 National Health Interview Survey. Data loads lazily.
#'
#' @section
#'
#' Used in Text: pages 18, 61, 110, 151, 165, 178, 184, 187-188, 258-259, 522-523
#'
#' @docType data
#'
#' @usage data('bwght')
#'
#' @format A data.frame with 1388 observations on 14 variables:
#' \itemize{
#' \item \strong{faminc:} 1988 family income, $1000s
#' \item \strong{cigtax:} cig. tax in home state, 1988
#' \item \strong{cigprice:} cig. price in home state, 1988
#' \item \strong{bwght:} birth weight, ounces
#' \item \strong{fatheduc:} father's yrs of educ
#' \item \strong{motheduc:} mother's yrs of educ
#' \item \strong{parity:} birth order of child
#' \item \strong{male:} =1 if male child
#' \item \strong{white:} =1 if white
#' \item \strong{cigs:} cigs smked per day while preg
#' \item \strong{lbwght:} log of bwght
#' \item \strong{bwghtlbs:} birth weight, pounds
#' \item \strong{packs:} packs smked per day while preg
#' \item \strong{lfaminc:} log(faminc)
#' }
#' @source \url{https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041}
#' @examples str(bwght)
"bwght"
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