#' @title Colour and Sex of Rock Crabs
#'
#' @description
#'
#' A sample of 200 rock crabs (Leptograpsus variegatus) found in the southern subtropical Pacific Ocean.
#' These are small sea crabs that grow at most to about 50 millimetres of shell width.
#'
#' The data contain the sex and species of each crab as determined by the researchers (see references).
#'
#'
#' @format A data frame with 200 rows and 2 variables
#' \describe{
#' \item{Species}{A two level factor distinguishing the species by colour: either "blue" or "orange" }
#' \item{Sex}{A two level factor identifying the crab's sex: either "male" or "female".}
#' }
#'
#'
#' @details
#'
#' The purpose of this data set is to identify which crabs in \code{lepto} belong to each of the four groups identified here.
#'
#' There are 50 of each combination of factor levels.
#'
#' Data are a subset of the \code{crabs} data set from the \code{MASS} package.
#' Only the species and sex variables appear here and their row order here now match (row for row) the
#' order of the rows from the physical size measurements on the purple rock crab given in \code{lepto}.
#'
#' This separation now allows clustering methods to be explored on the data set \code{lepto} and
#' compared to the classification by colour (Species) and sex given here.
#'
#' @docType data
#'
#' @name crabSpecies
#'
#' @seealso
#' \code{\link{lepto}}
#'
#' @keywords crabs nature MASS
#'
#' @author
#' R.W. Oldford
#'
#'
#' @references
#'
#' N.A. Campbell and R.J. Mahon (1974). "A multivariate study of variation in two species of rock crab of the genus Leptograpsus."
#' Australian Journal of Zoology 22, 417-425. <doi:10.1071/ZO9740417>
#'
#' Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer. <doi:10.1007/978-0-387-21706-2>
#'
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