[R] The spdep package

[Osmo Kolehmainen]

Hi,

Here is a listw object z corresponding to the matrix W. I understand n, 
nn,  S0, S1 and S2 in the weights constants summary. Is it simply so that 
n1 = n-1, n2 = n-2 and n3 = n-3? If this is true where they are needed?

Just wondering

Osmo


 > W
       [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
  [1,]    0    1    0    1    0    0    0    0    0
  [2,]    1    0    1    0    1    0    0    0    0
  [3,]    0    1    0    0    0    1    0    0    0
  [4,]    1    0    0    0    1    0    1    0    0
  [5,]    0    1    0    1    0    1    0    1    0
  [6,]    0    0    1    0    1    0    0    0    1
  [7,]    0    0    0    1    0    0    0    1    0
  [8,]    0    0    0    0    1    0    1    0    1
  [9,]    0    0    0    0    0    1    0    1    0
 > z=mat2listw(W);z
Characteristics of weights list object:
Neighbour list object:
Number of regions: 9
Number of nonzero links: 24
Percentage nonzero weights: 29.62963
Average number of links: 2.666667

Weights style: M
Weights constants summary:
   n n1 n2 n3 nn S0 S1  S2
M 9  8  7  6 81 24 48 272