#' Liver cancer data
#'
#' @description Survival in patients with liver cancer from the the Surveillance,
#' Epidemiology, and End Results (SEER) dataset.
#'
#' @name cancer
#'
#' @docType data
#'
#' @usage data(cancer)
#'
#' @keywords datasets
#' @examples
#' data(cancer)
#' head(cancer)
'cancer'