#' @title Rice data for Example 1
#' @name rice
#' @docType data
#' @keywords datasets
#' @usage data(rice)
#' @description Gomez & Gomez (1984, p. 143) report a rice experiment with three management practices (minimum, optimum, intensive), five different amounts of nitrogen (N) fertilizer (0, 50, 80, 110, 140 kg/ha), and three varieties (V1, V2, V3). The experiment involved variety and management as qualitative treatment factors and nitrogen fertilizer as a quantitative treatment factor. Overall, there were 45 treatment.
#' @format An object of class \code{data.frame} with 135 rows and 8 columns.
#' @details
#' \itemize{
#' \item{yield} Yield
#' \item{nrate} Nitrogen Rate
#' \item{nitrogen} Nitrogen
#' \item{Replicate} Replicate
#' \item{management} management
#' \item{variety} variety
#' \item{Main} Main
#' \item{Sub} Sub
#' }
#'
#' @references
#' Gomez, K. A., & Gomez, A. A. (1984). \emph{Statistical Procedures for Agricultural Research}.
#' John Wiley & Sons.
#'
#'
#' @examples
#' data(rice)
#'
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