#' Dataset from Dehejia and Wahba (1999)
#'
#' Subset of National Supported Work and PSID data from Dehejia and Wahba
#' (1999).
#' @format A data frame with 2,675 observations (2,490 controls from PSID, and
#' 185 treated individuals from NSW) and 11 variables.
#'
#' \describe{
#' \item{treated}{Treatment indicator}
#' \item{age}{Age in years}
#' \item{education}{Year of education}
#' \item{black}{Indicator for black}
#' \item{hispanic}{Indicator for Hispanic}
#' \item{married}{Indicator for married}
#' \item{re74}{Earnings in 1974 (in thousands of dollars)}
#' \item{re75}{Earnings in 1975 (in thousands of dollars)}
#' \item{re78}{Earnings in 1978 (in thousands of dollars)}
#' \item{ue74}{Indicator for zero earnings in 1974}
#' \item{ue75}{Indicator for zero earnings in 1975}
#' }
#' @source Rajeev Dehejia's website,
#' \url{http://users.nber.org/~rdehejia/nswdata2.html}
#' @references{
#'
#' \cite{Dehejia, R., and Wahba, S. (1999),
#' "Causal Effects in Nonexperimental Studies: Reevaluating
#' the Evaluation of Training Programs,"
#' Journal of the American Statistical Association, 94 (448), 1053-1062.}
#'
#' }
"NSW"
#' Experimental dataset from Dehejia and Wahba (1999)
#'
#' National Supported Work data from Dehejia and Wahba (1999).
#' @format A data frame with 445 observations (185 treated and 260 controls)
#' and 11 variables.
#'
#' \describe{
#' \item{treated}{Treatment indicator}
#' \item{age}{Age in years}
#' \item{education}{Year of education}
#' \item{black}{Indicator for black}
#' \item{hispanic}{Indicator for Hispanic}
#' \item{married}{Indicator for married}
#' \item{re74}{Earnings in 1974 (in thousands of dollars)}
#' \item{re75}{Earnings in 1975 (in thousands of dollars)}
#' \item{re78}{Earnings in 1978 (in thousands of dollars)}
#' \item{ue74}{Indicator for zero earnings in 1974}
#' \item{ue75}{Indicator for zero earnings in 1975}
#' }
#' @source Rajeev Dehejia's website,
#' \url{http://users.nber.org/~rdehejia/nswdata2.html}
#' @references{
#'
#' \cite{Dehejia, R., and Wahba, S. (1999),
#' "Causal Effects in Nonexperimental Studies: Reevaluating
#' the Evaluation of Training Programs,"
#' Journal of the American Statistical Association, 94 (448), 1053-1062.}
#'
#' }
"NSWexper"
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