#' @title ex31 from Duchateau, L. and Janssen, P. and Rowlands, G. J. (1998).\emph{Linear Mixed Models. An Introduction with applications in Veterinary Research}. International Livestock Research Institute.
#' @name ex31
#' @docType data
#' @keywords datasets
#' @usage data(ex31)
#' @format A \code{data.frame} with 38 rows and 6 variables.
#' @description ex31 is.
#' @details
#' \itemize{
#' \item herd Herds of Cattle
#' \item animal_id Animal ID
#' \item PCV1 Packed Cell Volume (PCV) determined at the time of treatment
#' \item PCV2 Packed Cell Volume (PCV) determined at a month later following treatment
#' \item dose Dose of Drugs
#' \item drug Two drugs against trypanosomosis, Berenil and Samorin, are studied
#' }
#' @author \enumerate{
#' \item Muhammad Yaseen (\email{myaseen208@@gmail.com})
#' }
#' @references \enumerate{
#' \item Duchateau, L. and Janssen, P. and Rowlands, G. J. (1998).\emph{Linear Mixed Models. An Introduction with applications in Veterinary Research}.
#' International Livestock Research Institute.
#' }
#' @seealso
#' \code{\link{Examp1.3.2}}
#' @examples
#' data(ex31)
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