#' Test sample data
#'
#' A sample data set for imputation test
#'
#' @format A data frame with 999 rows and 8 variables:
#' \describe{
#' \item{x}{the index}
#' \item{y}{outcome}
#' ...
#' }
#' @source \url{http://www.xxx.com/}
"sample_data"
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