#' Abundance of types of plankton
#'
#' The Plankton dataset contains data from a study of plankton numbers. Four types of plankton were sampled in 12 hauls. The hauls can be regarded as blocks. The types of plankton are the treatments.
#' @format
#' \describe{A data frame with 48 observations on the following three variables:
#'
#' \item{Haul}{a factor specifying the type of plankton.}
#' \item{Type}{a factor specifying whether fumigants have been to control nematodes. It has two levels, Not fumigated and fumigated.}
#' \item{Number}{a numerical vector recording the number of plankton.}
#' }
#' @source
#' Snedecor, G.W. & Cochran, W.G. (1967) Statistical Methods (6th Edition), page 329.
"Plankton"
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