#' Yield of oats with different fertilizer
#' treatments in a split-plot design
#'
#' Results of a classic split-plot experiment,
#' carried out at Rothamsted in 1931; also see Yates,
#' F. (1937) The Design and Analysis of Factorial Experiments,
#' page 74; John, P.W.M. (1971) Statistical
#' Design and Analysis of Experiments, page 99.
#' @format
#' \describe{A data frame with 72 observations on the
#' following six variables:
#' \item{blcoks}{a factor specifying six blocks.}
#' \item{wplots}{a factor specifying three whole-plots
#' for each block.}
#' \item{blcoks}{a factor specifying six blocks.}
#' \item{subplots}{a factor specifying four subplots
#' for each whole-plot}
#' \item{variety}{a factor specifying three varieties of oats (Victory, Golden rain and Marvellous).}
#' \item{nitrogen}{a factor specifying four different amounts
#' of nitrogen fertilizer (0, 0.2, 0.4 and 0.6 cwt).}
#' \item{yield}{a numerical vector recording yield of oats.}
#'
#' }
#'
#' @details
#' The design has two treatment factors: three varieties of
#' oats (Victory, Golden rain and Marvellous), and four levels
#' of nitrogen (0, 0.2, 0.4 and 0.6 cwt).
#' Because of limitations on the machines for sowing seed,
#' the different varieties could not conveniently be applied
#' to plots as small as those that could be used for the
#' different rates of fertilizer. So the design was set
#' up in two stages. First of all, the blocks were each
#' divided into three plots of the size required for the
#' varieties, and the three varieties were randomly allocated
#' to the plots within each block
#' (exactly as in a randomized-block design). Then each of
#' these plots, or whole-plots as they are usually known,
#' was split into four sub-plots
#' (one for each rate of nitrogen), and the allocation of
#' nitrogen was randomized independently within each
#' whole-plot.
#'
#' @source
#' VSN International (2014). Genstat for Windows 17th Edition.
#' VSN International, Hemel Hempstead, UK. Web page:
#' Genstat.co.uk
#'
#' @examples
#' moda <- aov(yield ~ nitrogen*variety + Error(blocks/wplots),data= Oats)
#' summary(moda)
#'
"oats"
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