spweights.constants {spdep} | R Documentation |
The function calculates the constants needed for tests of spatial autocorrelation for general weights matrices represented as listw
objects
spweights.constants(listw, zero.policy=FALSE) Szero(listw)
listw |
a listw object from for example nb2listw |
zero.policy |
if TRUE ignore zones without neighbours, if FALSE fail when encountered |
n |
number of zones |
n1 |
n - 1 |
n2 |
n - 2 |
n3 |
n - 3 |
nn |
n * n |
S0 |
global sum of weights |
S1 |
S1 sum of weights |
S2 |
S2 sum of weights |
Roger Bivand Roger.Bivand@nhh.no
Haining, R. 1990 Spatial data analysis in the social and environmental sciences, Cambridge University Press, p. 233; Cliff, A. D., Ord, J. K. 1981 Spatial processes, Pion, p. 19, 21.
data(oldcol) B <- spweights.constants(nb2listw(COL.nb, style="B")) W <- spweights.constants(nb2listw(COL.nb, style="W")) C <- spweights.constants(nb2listw(COL.nb, style="C")) S <- spweights.constants(nb2listw(COL.nb, style="S")) U <- spweights.constants(nb2listw(COL.nb, style="U")) print(data.frame(rbind(unlist(B), unlist(W), unlist(C), unlist(S), unlist(U)), row.names=c("B", "W", "C", "S", "U")))