#' @title Example 8.1 from Experimental Design and Analysis for Tree Improvement
#' @name Exam8.1
#' @description Exam8.1 presents the Diameter at breast height (Dbh) of 60 SeedLots
#' under layout of row column design with 6 rows and 10 columns in 18
#' countries and 59 provinces of 18 selected countries.
#' @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{DataExam8.1}}
#'
#' @importFrom car Anova
#' @import dae
#' @import dplyr
#' @importFrom emmeans emmeans emmip
#' @import ggplot2
#' @importFrom lmerTest lmer
#' @importFrom magrittr %>%
#' @import predictmeans
#' @importFrom stats lm anova model.tables
#'
#' @examples
#' library(car)
#' library(dae)
#' library(dplyr)
#' library(emmeans)
#' library(ggplot2)
#' library(lmerTest)
#' library(magrittr)
#' library(predictmeans)
#'
#' data(DataExam8.1)
#'
#' # Pg. 141
#' fm8.4 <-
#' aov(
#' formula = dbh ~ inoc + Error(repl/inoc) +
#' inoc*country*prov
#' , data = DataExam8.1
#' )
#'
#' # Pg. 150
#' summary(fm8.4)
#'
#' # Pg. 150
#' model.tables(x = fm8.4, type = "means")
#'
#' RESFit <-
#' data.frame(
#' fittedvalue = fitted.aovlist(fm8.4)
#' , residualvalue = proj(fm8.4)$Within[,"Residuals"]
#' )
#'
#' ggplot(
#' data = RESFit
#' , mapping = aes(x = fittedvalue, y = residualvalue)
#' ) +
#' geom_point(size = 2) +
#' labs(
#' x = "Residuals vs Fitted Values"
#' , y = ""
#' ) +
#' theme_bw()
#'
#' # Pg. 153
#' fm8.6 <-
#' aov(
#' formula = terms(
#' dbh ~ inoc + repl + col +
#' repl:row + repl:col +
#' prov + inoc:prov
#' , keep.order = TRUE
#' )
#' , data = DataExam8.1
#' )
#' summary(fm8.6)
NULL
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