R/pbc-data.R

In sparr: Spatial and Spatiotemporal Relative Risk

#' Primary biliary cirrhosis data
#' 
#' Data of the locations of 761 cases of primary biliary cirrhosis in several
#' adjacent health regions of north-eastern England, along with 3020 controls
#' representing the at-risk population, collected between 1987 and 1994. These
#' data were first presented and analysed by Prince et al. (2001); subsequent
#' analysis of these data in the spirit of \code{\link{sparr}} was performed in
#' Davies and Hazelton (2010). Also included is the polygonal study region.
#' 
#' @name pbc
#' @format \code{pbc} is a dichotomously marked
#' \code{\link[spatstat.geom:ppp]{ppp.object}}, with locations expressed in UK Ordnance
#' Survey Coordinates (km).
#' @docType data
#' @keywords data
#' @section Acknowledgements: The authors thank Prof. Peter Diggle for providing access
#' to these data.
#' @references Davies, T.M. and Hazelton, M.L. (2010), Adaptive kernel
#' estimation of spatial relative risk, \emph{Statistics in Medicine},
#' \bold{29}(23) 2423-2437.
#' @source Prince et al. (2001), The geographical distribution of primary
#' biliary cirrhosis in a well-defined cohort, \emph{Hepatology}, \bold{34},
#' 1083-1088.
#' @examples
#' 
#' data(pbc)
#' summary(pbc)
#' plot(pbc)
#' 
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