logLik.slrm
Loglikelihood of Spatial Logistic Regression
Computes the (maximised) loglikelihood of a fitted Spatial Logistic Regression model.
Usage
## S3 method for class 'slrm':
logLik(object, ..., adjust = TRUE)Arguments
- object
- a fitted spatial logistic regression model.
An object of class
"slrm". - ...
- Ignored.
- adjust
- Logical value indicating whether to adjust the loglikelihood of the model to make it comparable with a point process likelihood. See Details.
Details
This is a method for logLik for fitted spatial logistic
regression models (objects of class "slrm", usually obtained
from the function slrm). It computes the log-likelihood
of a fitted spatial logistic regression model.
If adjust=FALSE, the loglikelihood is computed
using the standard formula for the loglikelihood of a
logistic regression model for a finite set of (pixel) observations.
If adjust=TRUE then the loglikelihood is adjusted so that it
is approximately comparable with the likelihood of a point process
in continuous space, by subtracting the value
$n \log(a)$
where $n$ is the number of points in the original point pattern
dataset, and $a$ is the area of one pixel.
Value
- A numerical value.
See Also
Examples
X <- rpoispp(42)
fit <- slrm(X ~ x+y)
logLik(fit)
logLik(fit, adjust=FALSE)