sparr (version 0.2-2)

PBC: Primary biliary cirrhosis data

Description

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 sparr was performed in Davies and Hazelton (2010). Also included is the polygonal study region.

Usage

data(PBC)

source

Prince et al. (2001), The geographical distribution of primary biliary cirrhosis in a well-defined cohort, Hepatology, 34, 1083-1088.

Acknowledgements

The authors thank Prof. Peter Diggle at Lancaster University (http://www.lancs.ac.uk/staff/diggle/) for providing access to these data.

References

Davies, T.M. and Hazelton, M.L. (2010), Adaptive kernel estimation of spatial relative risk, Statistics in Medicine, 29(23) 2423-2437.

Examples

data(PBC)
plot(PBC$owin,main="PBC liver disease data")

points(PBC$data$x[PBC$data$ID==0],
 PBC$data$y[PBC$data$ID==0]) #controls
points(PBC$data$x[PBC$data$ID==1],
 PBC$data$y[PBC$data$ID==1], col = 2) #cases

legend("bottomleft", legend = c("case", "control"),
 pch = c(1, 1), col = c(2, 1))