spdep (version 0.1-2)

spweights.constants: Provides constants for spatial weights matrices

Description

The function calculates the constants needed for tests of spatial autocorrelation for general weights matrices represented as listw objects

Usage

spweights.constants(listw)
Szero(listw)

Arguments

listw

a listw object from for example nb2listw

Value

• 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

References

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.

See Also

nb2listw

Examples

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"))
print(data.frame(rbind(unlist(B), unlist(W), unlist(C), unlist(S)),
  row.names=c("B", "W", "C", "S")))