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#' Data from Home Owner's Survey on Total Number of Books
#'
#' Data from home owner's survey on total number of books
#' @name books
#' @docType data
#' @format Data frame with the following 6 variables:
#' \describe{
#' \item{shelf}{shelf number}
#' \item{number}{number of the book selected}
#' \item{purchase}{purchase cost of the book}
#' \item{replace}{replacement cost of book}
#' @note Used in Exercise 6 of Chapter 5.
#' @references Lohr (1999). Sampling: Design and Analysis, Duxbury, p. TODO and
#' 439.
#' @export
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