| 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)