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#' Types of Sampling Used for Articles in a Sample of Journals
#'
#' @name journal
#' @docType data
#' @format Data frame with the following 3 variables:
#' \describe{
#' \item{numemp}{number of articles in 1988 that used sampling}
#' \item{prob}{number of articlues that used probability sampling}
#' \item{nonprob}{number of articles that used nonprobability sampling}
#' }
#' @source Jacoby and Handlin (1991). TODO
#' @references Lohr (1999). Sampling: Design and Analysis, Duxbury, p. TODO and
#' 442.
#' @export
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