#' @title Data for Example 4.4 from Experimental Design and Analysis for Tree Improvement
#' @name DataExam4.4
#' @docType data
#' @keywords datasets
#' @description Exam4.4 presents the height means for 4 seedlots under factorial arrangement for two
#' levels of Fertilizer and two levels of Irrigation.
#' @usage data(DataExam4.4)
#' @format A \code{data.frame} with 32 rows and 5 variables.
#' \describe{
#' \item{\code{repl}}{Replication number}
#' \item{\code{irrig}}{Irrigation type}
#' \item{\code{fert}}{Fertilizer type}
#' \item{\code{seedlot}}{Seed Lot number}
#' \item{\code{height}}{Height of the plants}
#' }
#'
#' @author
#' \enumerate{
#' \item Muhammad Yaseen (\email{myaseen208@@gmail.com})
#' \item Sami Ullah (\email{samiullahuos@@gmail.com})
#' }
#'
#' @references
#' \enumerate{
#' \item E.R. Williams, C.E. Harwood and A.C. Matheson (2023). \emph{Experimental Design and Analysis for Tree Improvement}.
#' CSIRO Publishing (\href{https://www.publish.csiro.au/book/3145/}{https://www.publish.csiro.au/book/3145/}).
#' }
#'
#' @seealso
#' \code{\link{Exam4.4}}
#'
#' @examples
#' data(DataExam4.4)
#'
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