####################
## Abrasion.RData ##
####################
#' Abrasion loss
#'
#' Data on the weight loss due to abrasion,
#' hardness and tensile strength for 30 samples of rubber.
#'
#' @format  A data frame with 30 observations on the following 3 variables
#'
#' \describe{
#'   \item{\code{perdita}}{ weight loss (in grams per hour)}
#'   \item{\code{D}}{ hardness (in degrees Shore)}
#'   \item{\code{Re}}{ tensile strength (in kg/cm\eqn{^2})}
#' }
#'
#'
#' @source
#'
#'   Hand, D.J., Daly, F., Lunn, A.D., McConway, K.J., Ostrowski, E. (1994).
#'   \emph{Small Data Sets}. London Chapman and Hall/CRC.
#'

#########################
## Chlorsulfuron.RData ##
#########################
#' Chlorsulfuron Data
#'
#' Bioassay on the action of the herbicide chlorsulfuron on the callus area of colonies of Brassica napus L.
#' The experiment consists of 51 measurements for 10 different dose levels.
#' The design is unbalanced: the number of replicates per dose varies from a minimum of 5 to a maximum of 8.
#'
#' @format A data frame with 51 observations on the following 3 variables
#' \describe{
#'   \item{\code{gruppo}}{indicator variable for each tested dose}
#'   \item{\code{dose}}{the tested dose (nmol/l)}
#'   \item{\code{area}}{the callus area (mm^2)}
#' }
#'
#' @source
#'
#'  Package nlreg
#'
#'  Seiden, P., Kappel, D. e Streibig, J.C. (1998). Response of Brassica napus L. tissue culture to
#'  metsulfuron methyl and chlorsulfuron. \emph{Weed Research}, \bold{38}, 221-228.

#################
## Heart.RData ##
#################
#' Creatinine kinase and heart attacks
#'
#' Data on diagnosed heart attacks in a sample of 360 patients hospitalized with suspected heart attack.
#'
#' @format
#'
#' Data frame with 13 observations and the following 4 variables
#' \describe{
#'   \item{\code{mck}}{central value of the class of Creatinine kinase level in variable \code{ck}}
#'   \item{\code{ck}}{class of Creatinine kinase level (in IU per litre), factor with 13 levels
#'   (\code{Below 40}, \code{40-80}, \ldots, \code{480 and over})}
#'   \item{\code{ha}}{number of patients with diagnosed heart attack}
#'   \item{\code{nha}}{number of patients without heart attack}
#' }
#'
#'
#' @source
#'
#'   Hand, D.J., Daly, F., Lunn, A.D., McConway, K.J., Ostrowski, E. (1994).
#'   \emph{Small Data Sets}. London Chapman and Hall/CRC.
#'

#######################
## Biochemists.RData ##
#######################

#' Data frame with 915 observations on the following 6 variables
#'  \describe{
#'    \item{\code{art}}{count of articles produced during last 3 years of Ph.D.}
#'    \item{\code{fem}}{factor indicating gender of student, with levels Men and Women}
#'    \item{\code{mar}}{factor indicating marital status of student, with levels
#'      Single and Married}
#'    \item{\code{kid5}}{number of children aged 5 or younger}
#'    \item{\code{phd}}{prestige of Ph.D. department}
#'    \item{\code{ment}}{count of articles produced by Ph.D. mentor during last 3 years}
#' }

