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#' Follow-Up Study of Nonrespondents from Gnap (1995)
#'
#' Follow-up study of nonrespondents from the Gnap (1995) study on the
#' workload of elementary school teachers in Maricopa County, Arizona.
#' @name teachnr
#' @docType data
#' @format data frame with the following 6 variables:
#' \describe{
#' \item{hrwork}{number of hours required to work at school per week}
#' \item{size}{class size}
#' \item{preprmin}{minutes spent per week in school on preparation}
#' \item{assist}{minutes per week that a teacher's aide works with
#' the teacher in the classroom}
#' }
#' @note The study is described in Exercise 16 of Chapter 15. The
#' actual date are given in \code{\link{teachers}}. Cluster size data for
#' the original study are given in \code{\link{teachmi}}.
#' @source Data courtesy of Rita Gnap (1995).
#' @references Gnap, R. (1995). Teacher load in Arizona elementary school
#' districts in Maricopa County. Ph.D. diss., Arizona State University
#'
#' Lohr (1999). Sampling: Design and Analysis, Duxbury, p. TODO and
#' 446.
#' @export
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