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#' Coronary artery disease data
#'
#' A cross classified table with observational data from a Danish
#' heart clinic. The response variable is CAD (coronary artery
#' disease, some times called heart attack).
#'
#' @details
#'
#' Notice that data are collected at a heart clinic, so data do not
#' represent the population, but are conditional on patients having
#' ended up at the clinic.
#'
#' * cad1: Complete dataset, 236 cases.
#'
#' * cad2: Incomplete dataset, 67 cases. Information on (some of) the
#' variables 'Hyperchol', 'Smoker' and 'Inherit' is missing.
#'
#' @name data_cad
#' @aliases cad1 cad2
#' @docType data
#' @format A data frame with 236 observations on the following 14 variables.
#'
#' \describe{
#' \item{\code{Sex}}{Sex; a factor with levels \code{Female} \code{Male}}
#'
#' \item{\code{AngPec}}{Angina pectoris (chest pain attacks); a
#' factor with levels \code{Atypical} \code{None} \code{Typical}}
#'
#' \item{\code{AMI}}{Acute myocardic infarct; a factor with
#' levels \code{Definite} \code{NotCertain}}
#'
#' \item{\code{QWave}}{A reading from an electrocardiogram; a
#' factor with levels \code{No} \code{Yes}; Yes means pathological and is a sign of previous myocardial infarction. }
#'
#' \item{\code{QWavecode}}{a factor with levels \code{Nonusable}
#' \code{Usable}. An assesment of whether QWave is reliable.}
#'
#' \item{\code{STcode}}{a factor with levels
#' \code{Nonusable} \code{Usable}. An assesment of whether STchange is reliable.}
#'
#' \item{\code{STchange}}{A reading from an electrocardiogram; a factor
#' with levels \code{No} \code{Yes}. An STchange indicates a blockage of the coronary artery.}
#'
#' \item{\code{SuffHeartF}}{Sufficient heart frequency; a factor with levels \code{No}, \code{Yes}}
#'
#' \item{\code{Hypertrophi}}{a factor with levels \code{No}, \code{Yes}. Hypertrophy refers to an
#' increased size of the heart muscle due to exercise. }
#'
#' \item{\code{Hyperchol}}{a factor with levels \code{No} \code{Yes}. Hypercholesterolemia, also called high cholesterol,
#' is the presence of high levels of cholesterol in the blood.}
#'
#' \item{\code{Smoker}}{Is the patient a smoker; a factor with levels \code{No}, \code{Yes}.}
#'
#' \item{\code{Inherit}}{Hereditary predispositions for CAD; a factor with levels \code{No}, \code{Yes}.}
#'
#' \item{\code{Heartfail}}{Previous heart failures; a factor with levels \code{No} \code{Yes}}
#'
#' \item{\code{CAD}}{Coronary Artery Disease; a factor with levels
#' \code{No} \code{Yes}}. CAD refers to a reduction of blood flow
#' to the heart muscle (commonly known as a heart attack). The
#' diagnosis made from biopsies.
#'
#' }
#'
#'
#' @references Hansen, J. F. (1980). The clinical diagnoisis of ichaeme heart disease du to
#' coronary artery disease. Danish Medical Bulletin
#'
#' Højsgaard, Søren and Thiesson, Bo (1995). BIFROST - Block
#' recursive models Induced From Relevant knowledge, Observations and
#' Statistical Techniques. Computational Statistics and Data Analysis, vol. 19,
#' p. 155-175
#'
#'
#'
#' @keywords datasets
#' @usage data(cad1)
#'
#' @examples
#'
#' data(cad1)
#' ## maybe str(cad1) ; plot(cad1) ...
#'
"cad1"
"cad2"
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