[R-sig-Geo] How to create generalized spatial weight matrix in R

[Roger Bivand]

On Thu, 4 Dec 2003, Susumu [ISO-2022-JP] TANIMURA/$BC+B<(B $B?8(B wrote:

> 
> It is very happy to get response from the author of spdep.  The idea
> to use the boundary length proportions from a Voronoi diagram instead
> of polygon borders is ingenious for me.
> 
> Since  tripack or deldir seems to be related to voronoi diagram in
> current library of R, I am going to check these.  Do you have any
> other suggestions?

No, I was thinking of tripack, but both could do it. They already contain 
topology (left-right neighbours I think) and computing the length of the 
boundaries must be simple. Perhaps someone with time on their hands and 
access to a range of shapes could see if this would be a workable or a 
very bad hack? It should handle Iowa quite well, shouldn't it? Can 
RArcInfo give us lengths of shared boundaries as a target from e00 and Arc 
binary polygons, say get.arcdata()? Cliff and Ord exclude the study area 
boundary - the proportion is of all internal boundaries per polygon, this 
probably needs to be looked at too?

> 
> > > I have enjoyed Moran's I with spdep package, but I found
> > > nb2listw() supported only binary spatial weight matrix and its
> > > standardized one.
> > > 
> > See the glist argument to nb2listw() for the way to insert
> > generalised weights, such as inverse distance.
> 
> I overlooked the glist. You gave us example in help, so I now know how
> to make generalized spatial wight matrix from any other list.
> 
> > > Other than R, which software can create generalized spatial weight
> > > matrix?
> > 
> > On Windows, you could try GeoDa.
> 
> Ummm, I am a Linux user.

Any others with experience of benefits or otherwise of using generalised 
weights?

Roger

> 
> Thank you.
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: Roger.Bivand at nhh.no