#'Headache Data for Three Way ANOVA
#'
#'@description Measures of cholesterol concentration in 72 participants treated
#' with three different drugs. The aim is to examine the potential of new class
#' of drugs in lowering the cholesterol concentration and consequently reducing
#' heart attack.
#'
#' A pharmaceutical company tested three treatments for migraine headache
#' sufferers. 72 participants were enrolled in the experiments. The aim is to
#' examine the potential of new class of treatments in lowering the pain score
#' associated with the migraine headache episode.
#'
#' The participants include 36 males and 36 females. Males and females were
#' further (equally) subdivided into whether they were at low or high risk of
#' migraine headache.
#'
#' This data set is suited for three way Anova test.
#'
#' It contain the following variables: \itemize{ \item gender, which has two
#' categories: "male" and "female"; \item risk which has two levels: "low" and
#' "high" \item treatment, which has three categories: "X", "Y" and "Z". }
#'@name headache
#'@docType data
#'@usage data("headache")
#'@format A data frame with 72 rows and 4 columns.
#' @examples
#' data(headache)
#' head(as.data.frame(headache))
NULL
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