#' Testing dataset
#'
#' \code{testing_data} is an artificially generated dataset, based on
#' Friedman regression problem,that was created for testing preprocessing process on
#' ugly data with missing values, outliers, and so on.
#'
#'
#' @format A data frame with 1000 rows and 12 variables
#' @name testing_data
#' @docType data
#' @usage data(testing_data)
#'
NULL
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