#' Lalonde Data Set - Experimental Data .
#'
#' From \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#' "...Data are drawn from a paper by Robert Lalonde, "Evaluating the Econometric Evaluations of Training Programs," American Economic Review, Vol. 76, pp. 604-620. "
#'
#' @format A data frame with 445 rows and 10 variables:
#' \describe{
#' \item{TA}{treatment assignment}
#' \item{age}{Age}
#' \item{education}{Level of Education}
#' \item{black}{Black Indicator}
#' \item{hispanic}{Hispanic Indicator}
#' \item{married}{Indicator of Married}
#' \item{nodegree}{Indicator of "No Degree"}
#' \item{RE74}{Retrospective Earnings in 1974}
#' \item{RE75}{Retrospective Earnings in 1975}
#' \item{RE78}{Outcome Variable - Retrospective Earnings in 1978}
#' }
#' @source \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#'
"dw99nsw"
#' Lalonde Data Set - Panel Study of Income Dynamics Data: Full Data
#'
#' From \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#' "...Data are drawn from a paper by Robert Lalonde, "Evaluating the Econometric Evaluations of Training Programs," American Economic Review, Vol. 76, pp. 604-620. "
#'
#' @format A data frame with 2675 rows and 10 variables:
#' \describe{
#' \item{TA}{treatment assignment}
#' \item{age}{Age}
#' \item{education}{Level of Education}
#' \item{black}{Black Indicator}
#' \item{hispanic}{Hispanic Indicator}
#' \item{married}{Indicator of Married}
#' \item{nodegree}{Indicator of "No Degree"}
#' \item{RE74}{Retrospective Earnings in 1974}
#' \item{RE75}{Retrospective Earnings in 1975}
#' \item{RE78}{Outcome Variable - Retrospective Earnings in 1978}
#' }
#' @source \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#'
"dw99psid1"
#' Lalonde Data Set - Panel Study of Income Dynamics Data: First Subset
#'
#' From \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#' "...Data are drawn from a paper by Robert Lalonde, "Evaluating the Econometric Evaluations of Training Programs," American Economic Review, Vol. 76, pp. 604-620. "
#'
#' @format A data frame with 438 rows and 10 variables:
#' \describe{
#' \item{TA}{treatment assignment}
#' \item{age}{Age}
#' \item{education}{Level of Education}
#' \item{black}{Black Indicator}
#' \item{hispanic}{Hispanic Indicator}
#' \item{married}{Indicator of Married}
#' \item{nodegree}{Indicator of "No Degree"}
#' \item{RE74}{Retrospective Earnings in 1974}
#' \item{RE75}{Retrospective Earnings in 1975}
#' \item{RE78}{Outcome Variable - Retrospective Earnings in 1978}
#' }
#' @source \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#'
"dw99psid2"
#' Lalonde Data Set - Panel Study of Income Dynamics Data: Second Subset
#'
#' From \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#' "...Data are drawn from a paper by Robert Lalonde, "Evaluating the Econometric Evaluations of Training Programs," American Economic Review, Vol. 76, pp. 604-620. "
#'
#' @format A data frame with 313 rows and 10 variables:
#' \describe{
#' \item{TA}{treatment assignment}
#' \item{age}{Age}
#' \item{education}{Level of Education}
#' \item{black}{Black Indicator}
#' \item{hispanic}{Hispanic Indicator}
#' \item{married}{Indicator of Married}
#' \item{nodegree}{Indicator of "No Degree"}
#' \item{RE74}{Retrospective Earnings in 1974}
#' \item{RE75}{Retrospective Earnings in 1975}
#' \item{RE78}{Outcome Variable - Retrospective Earnings in 1978}
#' }
#' @source \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#'
"dw99psid3"
#' Lalonde Data Set - Current Population Survey Data: Full Data
#'
#' From \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#' "...Data are drawn from a paper by Robert Lalonde, "Evaluating the Econometric Evaluations of Training Programs," American Economic Review, Vol. 76, pp. 604-620. "
#'
#' @format A data frame with 2675 rows and 10 variables:
#' \describe{
#' \item{TA}{treatment assignment}
#' \item{age}{Age}
#' \item{education}{Level of Education}
#' \item{black}{Black Indicator}
#' \item{hispanic}{Hispanic Indicator}
#' \item{married}{Indicator of Married}
#' \item{nodegree}{Indicator of "No Degree"}
#' \item{RE74}{Retrospective Earnings in 1974}
#' \item{RE75}{Retrospective Earnings in 1975}
#' \item{RE78}{Outcome Variable - Retrospective Earnings in 1978}
#' }
#' @source \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#'
"dw99cps1"
#' Lalonde Data Set - Current Population Survey Data: First Subset
#'
#' From \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#' "...Data are drawn from a paper by Robert Lalonde, "Evaluating the Econometric Evaluations of Training Programs," American Economic Review, Vol. 76, pp. 604-620. "
#'
#' @format A data frame with 438 rows and 10 variables:
#' \describe{
#' \item{TA}{treatment assignment}
#' \item{age}{Age}
#' \item{education}{Level of Education}
#' \item{black}{Black Indicator}
#' \item{hispanic}{Hispanic Indicator}
#' \item{married}{Indicator of Married}
#' \item{nodegree}{Indicator of "No Degree"}
#' \item{RE74}{Retrospective Earnings in 1974}
#' \item{RE75}{Retrospective Earnings in 1975}
#' \item{RE78}{Outcome Variable - Retrospective Earnings in 1978}
#' }
#' @source \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#'
"dw99cps2"
#' Lalonde Data Set - Current Population Survey Data: Second Subset
#'
#' From \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#' "...Data are drawn from a paper by Robert Lalonde, "Evaluating the Econometric Evaluations of Training Programs," American Economic Review, Vol. 76, pp. 604-620. "
#'
#' @format A data frame with 313 rows and 10 variables:
#' \describe{
#' \item{TA}{treatment assignment}
#' \item{age}{Age}
#' \item{education}{Level of Education}
#' \item{black}{Black Indicator}
#' \item{hispanic}{Hispanic Indicator}
#' \item{married}{Indicator of Married}
#' \item{nodegree}{Indicator of "No Degree"}
#' \item{RE74}{Retrospective Earnings in 1974}
#' \item{RE75}{Retrospective Earnings in 1975}
#' \item{RE78}{Outcome Variable - Retrospective Earnings in 1978}
#' }
#' @source \url{https://users.nber.org/~rdehejia/data/.nswdata2.html}
#'
"dw99cps3"
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