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#' @title Example 7.3 from Generalized Linear Mixed Models: Modern Concepts, Methods and Applications by Walter W. Stroup (p-223)
#' @name Exam7.3
#' @description Exam7.3 explains multifactor models with some factors qualitative and some quantitative(Unequal slopes ANCOVA)
#' @author \enumerate{
#' \item Muhammad Yaseen (\email{myaseen208@@gmail.com})
#' \item Adeela Munawar (\email{adeela.uaf@@gmail.com})
#' }
#' @references \enumerate{
#' \item Stroup, W. W. (2012).
#' \emph{Generalized Linear Mixed Models: Modern Concepts, Methods and Applications}.
#' CRC Press.
#' }
#'
#'
#' @seealso
#' \code{\link{DataSet7.3}}
#'
#' @import parameters
#' @import emmeans ggplot2
#' @importFrom car Anova
#'
#' @examples
#'
#' library(car)
#' library(ggplot2)
#' library(emmeans)
#' data(DataSet7.3)
#'
#' DataSet7.3$trt <- factor(x = DataSet7.3$trt )
#'
#' ##----ANCOVA(Unequal slope Model)
#' Exam7.3fm1 <- aov(formula = y ~ trt*x, data = DataSet7.3)
#' car::Anova( mod = Exam7.3fm1 , type = "III")
#'
#' Plot <-
#' ggplot(
#' data = DataSet7.3
#' , mapping = aes(x = factor(trt), y = x)
#' ) +
#' geom_boxplot(width = 0.5) +
#' coord_flip() +
#' geom_point() +
#' stat_summary(
#' fun = "mean"
#' , geom = "point"
#' , shape = 23
#' , size = 2
#' , fill = "red"
#' ) +
#' theme_bw() +
#' ggtitle("Covariate by treatment Box Plot") +
#' xlab("Treatment")
#' print(Plot)
#'
#' ##----ANCOVA(Unequal slope Model without intercept at page 224)
#' Exam7.3fm2 <- lm(formula = y ~ 0 + trt/x, data = DataSet7.3)
#' summary(Exam7.3fm2)
#' library(parameters)
#' model_parameters(Exam7.3fm2)
#'
#' ##--Lsmeans treatment at x=7 & 12 at page 225
#' emmeans(object = Exam7.3fm2, specs = ~trt|x, at = list(x = c(7, 12)))
#'
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