burk: Burkitt's lymphoma in Uganda

In tilmandavies/sparr: Spatial and Spatiotemporal Relative Risk

Burkitt's lymphoma in Uganda

Description

Data of the spatiotemporal locations of Burkitt's lymphoma in the Western Nile district of Uganda from 1960 to 1975.

Format

burk is a named list with three members:

$cases

An object of class 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 owin; as well as the time (in days since 1/1/1960) of each observation stored as the marks of the points.

$cases.age

A numeric vector of length 188 giving the age of each individual in $cases.

$controls

An object of class ppp giving 500 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 burkitt object of the splancs R package; see

Rowlingson B. and Diggle P.J. (2017), splancs: Spatial and Space-Time Point Pattern Analysis, R package version 2.01-40; https://CRAN.R-project.org/package=splancs.

References

Bailey, T.C. and Gatrell, A.C. (1995), Interactive spatial data analysis, Longman; Harlow.

Middleton, J.F.M. and Greenland, D.J. (1954), Land and population in West Nile District, Uganda, The Geographical Journal, 120, 446–455.

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)

tilmandavies/sparr documentation built on July 8, 2024, 2:57 p.m.