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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/burk-data.R
\docType{data}
\name{burk}
\alias{burk}
\title{Burkitt's lymphoma in Uganda}
\format{
\code{burk} is a named list with three members:
\describe{
\item{\code{$cases}}{
An object of class \code{\link[spatstat.geom]{ppp}} giving the spatial locations (eastings/northings)
of the 188 cases of Burkitt's lymphoma recorded in individuals of various ages (mostly children); the spatial study region as a polygonal \code{\link[spatstat.geom]{owin}}; as well as the time
(in days since 1/1/1960) of each observation stored as the \code{marks} of the points.
}
\item{\code{$cases.age}}{
A numeric vector of length 188 giving the age of each individual in \code{$cases}.
}
\item{\code{$controls}}{
An object of class \code{\link[spatstat.geom]{ppp}} giving 500 \bold{artificially simulated} spatial-only
observations to pose as a `control' data set representing the at-risk population. The data were
generated from a smooth kernel estimate of the spatial margin of the cases. The similarity between the case point distribution
and the true at-risk population dispersion can be seen in e.g. Figure 2 of Middleton and Greenland (1954).
}
}
}
\source{
The case data were extracted from the \code{\link[splancs]{burkitt}} object of the \code{splancs} R package;
see \cr\cr
Rowlingson B. and Diggle P.J. (2017), splancs: Spatial and Space-Time Point Pattern Analysis, R
package version 2.01-40; \url{https://CRAN.R-project.org/package=splancs}.
}
\description{
Data of the spatiotemporal locations of Burkitt's lymphoma in the Western Nile district of Uganda
from 1960 to 1975.
}
\examples{
data(burk)
summary(burk$cases)
oldpar <- par(mfrow=c(1,3))
plot(burk$cases)
plot(burk$controls)
plot(density(marks(burk$cases)),xlim=range(marks(burk$cases)))
par(oldpar)
}
\references{
Bailey, T.C. and Gatrell, A.C. (1995), \emph{Interactive spatial data analysis}, Longman; Harlow.
Middleton, J.F.M. and Greenland, D.J. (1954), Land and population in West Nile District, Uganda, \emph{The Geographical Journal}, \bold{120}, 446--455.
}
\keyword{data}
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