[R] How to create a nb object

[Bill Hyman]

Dear all,

I am looking at the example in spdep for autocorrelation test as below. However, 
how can one create a nb object for your data? Suppose you have data COL.OLD. But 
how do you create COL.nb from there? Many thanks for your help!

Bill

#######################################################
library(spdep)

data(oldcol)

dim(COL.OLD)
head(COL.OLD)

geary.test(COL.OLD$CRIME, nb2listw(COL.nb, style="W"))
geary.test(COL.OLD$CRIME, nb2listw(COL.nb, style="W"),
 randomisation=FALSE)