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#' Chemical manufacturing process data set
#'
#' @description
#' A data set that models yield as a function of biological material predictors
#' and chemical structure predictors.
#'
#' @name chem_proc_yield
#' @aliases chem_proc_yield
#' @docType data
#' @return \item{chem_proc_yield}{a tibble}
#'
#' @details
#' This data set contains information about a chemical manufacturing
#' process, in which the goal is to understand the relationship between
#' the process and the resulting final product yield. Raw material in
#' this process is put through a sequence of 27 steps to generate the
#' final pharmaceutical product. The starting material is generated from
#' a biological unit and has a range of quality and characteristics. The
#' objective in this project was to develop a model to predict percent
#' yield of the manufacturing process. The data set consisted of 177
#' samples of biological material for which 57 characteristics were
#' measured. Of the 57 characteristics, there were 12 measurements of
#' the biological starting material, and 45 measurements of the
#' manufacturing process. The process variables included measurements
#' such as temperature, drying time, washing time, and concentrations of
#' by-products at various steps. Some of the process measurements can
#' be controlled, while others are observed. Predictors are continuous,
#' count, categorical; some are correlated, and some contain missing
#' values. Samples are not independent because sets of samples come from
#' the same batch of biological starting material.
#'
#' Columns:
#' \itemize{
#' \item \code{yield}: numeric
#' \item \code{bio_material_01} - \code{bio_material_12}: numeric
#' \item \code{man_proc_01} - \code{man_proc_45}: numeric
#' }
#' @source
#' Kuhn, Max, and Kjell Johnson. _Applied predictive modeling_. New York:
#' Springer, 2013.
#'
#' @examples
#' data(chem_proc_yield)
#' str(chem_proc_yield)
#'
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