Re: st: spatial modeling stata

[Nomoreno <nomorenook@netscape.net>]

Hi Julia,

Thanks a lot for your information. It is totally new to me that Stata 
has commands for spatial analysis. I looked at the Stata code for 
contracting the weighting matrix, but I am not sure the mechanism behind 
it. Could you explain it to me, if you understand it? I mean, it seems 
to me that the command "spatwmat" uses both y and x to construct the 
weighting matrix, how come? It also occurs to me that each unit has only 
one value, is that so? What exactly are the xcoord(x) and ycoord(y) 
representing?


Thanks,
Simon

jgamas@mit.edu wrote:


> Dear Mahdi,
> I have done spatial regression using spatreg and a few more commands in Stata. 
> I don't know if this is what you are after.  The person who wrote the stata
> programs and has helped me with some of my questions is Maurizio Pisati (he is
> listed after the spatreg commands).  Stata gives you the option of two models:
> spatial correlation or spatial lag, but not the general model that includes
> both.  However, if you want the general model that includes both, I don't think
> Stata does it.  A collegue of mine uses MATLAB and I know for sure it does the
> more general model because I used their manual once to help me understand the
> model itself.  I also love Stata and hate to have to go to another software.
> I hope this helps.
> Julia A. Gamas
> Mexico City Project
> MIT
> 77 Massachusetts Avenue 54-1823
> Cambridge, MA 02139
> 617 258 0230
> jgamas@mit.edu
>
>
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/