On Thu, 14 Jul 2011, Kitty Lee wrote:
Hi. I have a shapefile. I guess because of cartography problem, the
border of some of the units that are supposed to be physically connected
are 'snapped' properly. As a result, when I use poly2nb, there are empty
links.
Did you notice on the help page for poly2nb() that you can snap within the
function? Had you quoted your code verbatim, and added the output of
sessionInfo(), replying would have been easier. If you did use the snap=
argument, are your polygons malformed? Can you clean then in a topological
GIS first?
Hope this helps,
Roger
I know I can set zero.policy=T in nb2listw. But I'm trying to use
skater() function. I notice that it won't accept spatial weight matrix
with empty link.
Any advice on how can I easily fix the matrix? Is there a way I can fill
in empty link with nearest neighbors?
I'd really appreciate advice on how to manually tweak the connectivity
matrix.
Thanks in advance!
K.
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Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
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e-mail: roger.biv...@nhh.no
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