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#' Data from a stratified random sample of size 300 from
#' the U.S. 1992 Census of Agriculture.
#'
#' @name agstrat
#' @docType data
#' @format Data frame with the following 17 variables:
#' \describe{
#' \item{county}{county name}
#' \item{state}{state abbreviation}
#' \item{acres92}{number of acres devoted to farms, 1992}
#' \item{acres87}{number of acres devoted to farms, 1987}
#' \item{acres82}{number of acres devoted to farms, 1982}
#' \item{farms92}{number of farms, 1992}
#' \item{farms87}{number of farms, 1987}
#' \item{farms82}{number of farms, 1982}
#' \item{largef92}{number of farms with 1000 acres or more, 1992}
#' \item{largef87}{number of farms with 1000 acres or more, 1987}
#' \item{largef82}{number of farms with 1000 acres or more, 1982}
#' \item{smallf92}{number of farms with 9 acres or fewer, 1992}
#' \item{smallf87}{number of farms with 9 acres or fewer, 1987}
#' \item{smallf82}{number of farms with 9 acres or fewer, 1982}
#' \item{region}{factor with levels \code{S} (south), \code{W} (west),
#' \code{NC} (north central), \code{NE} (northeast)}
#' \item{rn}{random numbers used to select sample in each stratum}
#' \item{weight}{sampling weighs for each county in sample}
#' }
#' @source U.S. 1992 Census of Agriculture
#' @references Lohr (1999). Sampling: Design and Analysis, Duxbury, p. TODO and
#' 437.
#' @export
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