On Thu, 11 Mar 2010, Scott L Minkoff wrote:
Hello,
I am new to analyzing spatial data in R and was having trouble finding an
answer to my question in the list archives. I am interested in doing
spatial regression with an inverse distance matrix. To do this, I created
the weights matrix outside of R (in ArcGIS) and then used the mat2listw
function to convert it to a list that could be used in a spatial regression
with the spdep package. I am wondering whether this is an appropriate way
to do this and, if not, what would be?
No, not appropriate as such, unless your distances are neither Euclidean
nor Great Circle. See the examples on ?nbdists and ?nb2listw, or on the
use og the glist= argument to nb2listw() to move the weights from your
imported object via mat2listw(). When you use mat2listw(), there is no
automatic way of setting the style of the listw object, so although it can
be used for some things, it needs feeding through nb2listw() to tidy
things up.
Roger
Thanks in advance,
Scott Minkoff
University of Colorado at Boulder
Department of Political Science
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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [email protected]
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