AAFMM: Augment Applications in Fitting Mixed Models

#' @title barley
#' 
#' @description barley dataset from asreml package.
#' 
#' @docType data
#' @keywords datasets
#' @name barley
#' @usage data(barley)
#' @format one dataset with 7 variables
#' \describe{
#'  \item{Rep}{Replicate,levels with 6}
#'  \item{RowBlk}{levels with 30}
#'  \item{ColBlk}{levels with 30}
#'  \item{Row}{levels with 10}
#'  \item{Column}{levels with 15}
#'  \item{Variety}{levels with 25}
#'  \item{yield}{a numeric vector}
#' }
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