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#' United Kingdom Pig Production
#'
#' This data contains about the United Kingdom Pig Production from the book 'Data' by Andrews and Herzberg. The original data can be on Statlib: http://lib.stat.cmu.edu/datasets/Andrews/T62.1
#'
#' The time variable has been added from a combination of year and quarter
#'
#' @details \itemize{
#' \item time year + (quarter - 1) / 4
#' \item year year of production
#' \item quarter quarter of the year of production
#' \item gilts number of sows giving birth for the first time
#' \item profit ratio of price to an index of feed price
#' \item s_per_herdsz ratio of the number of breeding pigs slaughtered to the total breeding herd size
#' \item production number of pigs slaughtered that were reared for meat
#' \item herdsz breeding herd size
#' }
#'
#' @docType data
#' @keywords datasets
#' @name pigs
#' @usage data(pigs)
#' @format A data frame with 48 rows and 8 variables
#' @references
#' Andrews, David F., and Agnes M. Herzberg. Data: a collection of problems from many fields for the student and research worker. Springer Science & Business Media, 2012.
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