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#' Breast cancer mortality in the Northeastern United States
#'
#' An \code{\link[sf]{sf}} object containing data related to
#' breast cancer mortality in the Northeastern United
#' States. The data include several variables observed for
#' 245 counties (or similar) as well polygon information defined using
#' longitude/latitude coordinates in the WGS84 coordinate
#' system. The following variables are included in the
#' object:
#' \itemize{
#' \item \code{id}: A name-based id for each county.
#' \item \code{cases}: The number of breast cancer
#' mortality cases between 1988-1992.
#' \item \code{population}: The number of residents in the county
#' based on 1990 U.S. census results.
#' \item \code{x}: An x coordinate of a centroid associated
#' with each county provided by Kulldorff et al. (2003). See
#' Details.
#' \item \code{y}: A y coordinate of a centroid associated
#' with each county provided by Kulldorff et al. (2003). See
#' Details.
#' }
#'
#' The \code{x} and \code{y} coordinates define centroids
#' associated with each county. The coordinates were
#' provided by Kulldorf et al. (2003). They are appropriate
#' for computing standard Euclidean intercentroid distance
#' between counties but are not consistent with the polygon
#' geometry of the data set. The coordinate system
#' of these coordinates is unknown.
#'
#' Alternative centroids for the geometry can be obtained
#' using the following commands.
#'
#' \code{sf::sf_use_s2(FALSE)} \cr
#' \code{pts <- sf::st_centroid(sf::st_geometry(neast))}
#'
#' @name neast
#' @docType data
#' @references Martin Kulldorff, Eric J. Feuer, Barry A.
#' Miller, Laurence S. Freedman; Breast Cancer Clusters in
#' the Northeast United States: A Geographic Analysis,
#' American Journal of Epidemiology, Volume 146, Issue 2,
#' 15 July 1997, Pages 161–170.
#' \doi{10.1093/oxfordjournals.aje.a009247}.
#'
#' @keywords data
#' @examples
#' if (require(sf)) {
#' data(neast)
#' plot(st_geometry(neast))
#' plot(neast["cases"])
#' }
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