The approximate-profile likelihood estimator for the spatial autocorrelation parameter from a simultaneous autoregressive (SAR) model (Li et al. 2007).
Usage
aple(x, w, digits = 3)
Value
the APLE estimate, a numeric value.
Arguments
x
Numeric vector of values, length n. This will be standardized internally with scale(x).
w
An n x n row-standardized spatial connectivity matrix. See shape2mat.
digits
Number of digits to round results to.
Details
The APLE is an estimate of the spatial autocorrelation parameter one would obtain from fitting an intercept-only SAR model. Note, the APLE approximation is not reliable when the number of observations is large.