#' Breast Cancer Wisconsin (Original) Data Set
#'
#' Samples arrive periodically as Dr. Wolberg reports his clinical cases.
#' The database therefore reflects this chronological grouping of the data.
#'
#' @format A data frame with 699 observations on the following 11 variables.
#' - `sample_code_number`: id number
#' - `clump_thickness`: 1 - 10
#' - `uniformity_of_cell_size`: 1 - 10
#' - `uniformity_of_cell_shape`: 1 - 10
#' - `single_epithelial_cell_size`: 1 - 10
#' - `bare_nuclei`: 1 - 10
#' - `bland_chromatin`: 1 - 10
#' - `normal_nucleoli`: 1 - 10
#' - `mitoses`: 1 - 10
#' - `class`: 2 for benign, 4 for malignant
#'
#' @source
#' Dr. William H. Wolberg - Physician
#' University of Wisconsin Hospitals
#' Madison, Wisconsin, USA
#'
#' @references
#'
#' <https://archive.ics.uci.edu/ml/machine-learning-databases/breast-cancer-wisconsin/breast-cancer-wisconsin.data>
#'
#' @details
#' This grouping information appears immediately below, having been removed from the data itself:
#'
#' \tabular{rrr}{
#' Group \tab Instances \tab Date of Collection\cr
#' 1 \tab 367 \tab January 1989\cr
#' 2 \tab 70 \tab October 1989\cr
#' 3 \tab 31 \tab February 1990\cr
#' 4 \tab 17 \tab April 1990\cr
#' 5 \tab 48 \tab August 1990\cr
#' 6 \tab 49 \tab Updated January 1991\cr
#' 7 \tab 31 \tab June 1991\cr
#' 8 \tab 86 \tab November 1991\cr
#' Total \tab 699 points \tab 15 July 1992
#' }
#'
#' Note that the results summarized above in Past Usage refer to a dataset of
#' size 369, while Group 1 has only 367 instances. This is because it
#' originally contained 369 instances; 2 were removed.
"bcw_original"
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