spatialAtRisk.function: spatialAtRisk.function function
Description
Creates a spatialAtRisk object from a function mapping
R^2 onto the non negative reals. Note that for
spatialAtRisk objects defined in this manner, the user is
responsible for ensurng that the integral of the function
is 1 over the observation window of interest.
Usage
## S3 method for class 'function':
spatialAtRisk(X, warn = TRUE, ...)
Arguments
X
a function with accepts arguments x and y that
returns the at risk population at coordinate (x,y), which
should be a numeric of length 1
warn
whether to issue a warning or not
...
additional arguments
Value
object of class spatialAtRisk NOTE The function provided
is assumed to integrate to 1 over the observation window,
the user is responsible for ensuring this is the case.
Brix A, Diggle PJ (2001).
Spatiotemporal Prediction for log-Gaussian Cox processes.
Journal of the Royal Statistical Society, Series B,
63(4), 823-841.
Diggle P, Rowlingson B, Su T
(2005). Point Process Methodology for On-line
Spatio-temporal Disease Surveillance. Environmetrics,
16(5), 423-434.