Re: Spatial Weight Matrix

Your problem is that you have to use the shp and use it to create the
matrix.
if you need to read the shape file, probably use.
SHPFILE= readShapePoly(filename, IDvar)
you can use also readOGR from rgdal.
then use poly2nb this way.
nb.polyWV=poly2nb(SHPFILE)
the SHPFILE are in yellow because are the same.
then you convert your nb to a listw  and use it.
WVlistw=nb2listw(nb.polyWV, style="W")
I used style W for row standardization.
Hope this helps
Juan.

On Wed, Jun 20, 2012 at 6:17 PM, Saima Bashir <saimabashir11 <at> yahoo.com>wrote:

> I want to built Spatial Weight Matrix for West Virginia only. I have
> downloaded shape file from US census wesite then imported into R. I was
> doing following steps:
>
> i. read.shape("C:\\Users\\sbashir\\Desktop\\R\\fe_2007_54.shp")
>
> ii. Creat neighbors list
>
> Wnbq <- cell2nb(6, 6, type = "queen")
>
> summary(Wnbq)
>
> iii. Spatial Weights
>