#' @title
#' Classification by two radiologists of 85 xeromammograms as normal, benign disease, suspicion of cancer, or cancer
#'
#' @description
#' Classification by two radiologists of 85 xeromammograms as normal, benign
#' disease, suspicion of cancer, or cancer (a subset of the data from Boyd et
#' al. (1982) and discussed in the context of kappa in Altman (1991, 403–405).
#'
#'
#' @format A tibble with 85 observations (Normal, Benign, Suspect, Cancer) on 2 variables representing
#' different raters.
#' \describe{
#' \item{radiologist_a}{ratings of Radiologist a (see levels above)}
#' \item{radiologist_b}{ratings of Radiologist b (see levels above)}
#' }
#'
#' @references
#' Altman, D. G. 1991. Practical Statistics for Medical Research. London: Chapman & Hall/CRC
#'
#' @source
#' Boyd, N. F., C. Wolfson, M. Moskowitz, T. Carlile, M. Petitclerc, H. A.
#' Ferri, E. Fishell, A. Gregoire, M. Kiernan, J. D. Longley, I. S. Simor, and
#' A. B. Miller. 1982. Observer variation in the interpretation of
#' xeromammograms. Journal of the National Cancer Institute 68: 357–363.
#'
#' [Datasets for Stata Base Reference Manual, Release 13](https://www.stata-press.com/data/r13/r.html#r)
#'
#' @examples
#' radiologist
#'
#' library(dplyr)
#' library(tidyr)
#' radiologist %>%
#' with(., table(radiologist_a, radiologist_b)) %>%
#' addmargins()
"radiologist"
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