#' @title Data for Example 5.1 from Experimental Design and Analysis for Tree Improvement
#' @name DataExam5.1
#' @docType data
#' @keywords datasets
#' @description Exam5.1 presents the height of 27 seedlots from 4 sites.
#' @usage data(DataExam5.1)
#' @format A \code{data.frame} with 108 rows and 4 variables.
#' \describe{
#' \item{\code{site}}{Sites for the experiment}
#' \item{\code{seedlot}}{Seed lot number}
#' \item{\code{ht}}{Height of the plants}
#' \item{\code{sitemean}}{Mean Height of Each Site}
#' }
#'
#' @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{Exam5.1}}
#'
#' @examples
#' data(DataExam5.1)
#'
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