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Re: st: Spatial lag models


From   n j cox <n.j.cox@durham.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Spatial lag models
Date   Wed, 29 Mar 2006 11:19:28 +0100

The eigenvalues would ideally come from -spatwmat-,
which was written for Stata 7, and uses -matrix symeigen-,
hence the restriction you report.

In Stata 7 or 8, there is a -geneigen- program by Kit
Baum on SSC that doesn't require symmetry.

. findit eigenvalues

would have pointed you towards that.

In Stata 9, Mata would, I presume, be the best way to do it.

As for spatial data and panel models, does the _theory_ exist
even?

Nick
n.j.cox@durham.ac.uk

Kate Ivanova

I need to estimate a model with a spatially lagged dependent variable and
have downloaded a Stata add-on called spatreg. However, I cannot use it
since my spatial weight matrix is not symmetric and the program cannot
compute the eigenvalues.

I would appreciate it very much if anyone could let me know if there are any
ways in Stata to estimate a spatial lag model with a non-symmetric spatial
weight matrix or any procedures to compute the eigenvalues for a
non-symmetric matrix.

I am also interested if there are any commands to estimate a spatial lag
model using panel data.

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