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.