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#' @title Test data
#'
#' @description A simulated data frame for illustration. In the test data, \eqn{X_1} and \eqn{X_2} are continuous variables, \eqn{X_3}
#' and \eqn{X_4} are binary variables, \eqn{Y} is the continuous outcome, and \eqn{Z} is the dichotomous treatment indicator.
#' @name test_data
#' @docType data
#' @usage test_data
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