modeldata: Data Sets Useful for Modeling Examples

#' Customer churn data
#'
#' A data set from the MLC++ machine learning software for modeling customer
#' churn. There are 19 predictors, mostly numeric: `state` (categorical),
#' `account_length` `area_code` `international_plan` (yes/no),
#' `voice_mail_plan` (yes/no), `number_vmail_messages`
#' `total_day_minutes` `total_day_calls` `total_day_charge`
#' `total_eve_minutes` `total_eve_calls` `total_eve_charge`
#' `total_night_minutes` `total_night_calls`
#' `total_night_charge` `total_intl_minutes`
#' `total_intl_calls` `total_intl_charge`, and
#' `number_customer_service_calls`.
#'
#' The outcome is contained in a column called `churn` (also yes/no).
#' A note in one of the source files states that the data are "artificial based
#' on claims similar to real world".
#'
#' @name mlc_churn
#' @aliases mlc_churn
#' @docType data
#' @return \item{mlc_churn}{a tibble}
#' @source Originally at `http://www.sgi.com/tech/mlc/`
#' @keywords datasets
#' @examples
#' data(mlc_churn)
#' str(mlc_churn)
NULL