eigenw {spdep} | R Documentation |
The function returns a numeric vector of eigenvalues of the weights matrix
generated from the spatial weights object listw
. The eigenvalues are
used to speed the computation of the Jacobian in spatial SAR model estimation:
log(det[I - rho W]) = logprod_{i=1}^{n}(1 - rho λ_i)
where $W$ is the n by n spatial weights matrix, and $λ_i$ are the eigenvalues of $W$.
eigenw(listw, quiet=TRUE)
listw |
a listw object created for example by nb2listw |
quiet |
set to FALSE for short summary |
a numeric vector of eigenvalues of the weights matrix generated from the
spatial weights object listw
.
Roger Bivand Roger.Bivand@nhh.no
Cliff, A. D., Ord, J. K. 1981 Spatial processes, Pion, p. 155; Ord, J. K. 1975 Estimation methods for models of spatial interaction, Journal of the American Statistical Association, 70, 120-126.
data(oldcol) W.eig <- eigenw(nb2listw(COL.nb, style="W")) 1/range(W.eig) S.eig <- eigenw(nb2listw(COL.nb, style="S")) 1/range(S.eig) B.eig <- eigenw(nb2listw(COL.nb, style="B")) 1/range(B.eig)