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#' A factorial design for the improvement of PET film tensile strength.
#'
#' @format An object of classes design and data.frame with 12 observations of
#' 4 variables.
#'
#' @description The data corresponds to full factorial design with two factors
#' coded as +/- and 3 replicates for each combination.
#'
#' \describe{
#' \item{A}{PET formulation A (factor)}
#' \item{B}{PET formulation B (factor)}
#' \item{replicate}{the measurement replicate I to III (factor)}
#' \item{yield}{the output variable measured on the PET, (numerical)}
#' }
#'
#' @source
#' Original data set generated with the function
#' \code{\link[DoE.base]{fac.design}} form the package DoE.base.
#'
#' @references
#' For a complete case study application refer to \url{https://j-ramalho.github.io/industRial/}
#'
#' @examples
#' data(pet_doe)
#' contrasts(pet_doe$A)
#'
"pet_doe"
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