stat340: Data and functions for BIAS at NMBU

#' STAT210prob2.35: Monozygotic Twins
#'
#' An article in the journal \emph{Neurology} observed that monozygotic twins
#' (identical twins) share numerous physical, psychological, and pathological
#' traits. This data is from the study where the investigators measured an
#' intelligence score of 10 pairs of twins with ages between 24 and 43 years.
#'
#' @format A data frame with 10 observations (rows) and 3 variables (columns).
#' \tabular{llllr}{
#'   \tab \bold{Column name} \tab \bold{Data type} \tab \bold{Description} \tab \bold{Values}\cr
#'   \code{[,1]} \tab \code{Pair} \tab integer \tab The pair of identical twins \tab (1 - 10)\cr
#'   \code{[,2]} \tab \code{Birth_order1} \tab numeric \tab Intelligence score for twin 1 \tab (6.03 - 7.99)\cr
#'   \code{[,3]} \tab \code{Birth_order2} \tab numeric \tab Intelligence score for twin 2 \tab (5.73 - 8.76)
#' }
#'
#' @details
#'
#' This is data from Exercise 2.35 in Design and Analysis of Experiments, 9th
#' Edition, EMEA Edition.
#'
#' @examples
#'
#' # A short summary of the variables
#' summary(STAT210prob2.35)
#'
#' # Intelligence score for both twins
#' plot(STAT210prob2.35$Birth_order1,
#'      STAT210prob2.35$Birth_order2,
#'      xlab = "Intelligence score, twin 1",
#'      ylab = "Intelligence score, twin 2",
#'      main = "Intelligence score for both twins in all pairs of twins")
#'
#'
#' @source Montgomery, D. C. (2019) \emph{Design and Analysis of Experiments,
#' 9th Edition, EMEA Edition}. New York: Wiley.
#'
#' @references
#'
#' Tramo, M. J., et al. (1998) Brain size, head size, and intelligence quotient
#' in monozygotic twins. \emph{Neurology}, \bold{50}, 1246–-1252.
#'
#' @docType data
#' @keywords datasets
#' @name STAT210prob2.35
#' @usage STAT210prob2.35
#'
"STAT210prob2.35"