Re: [Openspace] problems about weight matrix and spatial regression

[Julia Koschinsky]

GeoDa's spatial regression models are estimated using Maximum Likelihood, which require symmetric weights (i.e. you can't use KNN weights here). 

To run a spatial estimator with asymmetric/KNN weights, you can use GeoDaSpace/PySAL sreg or R. Julia

On 7 May 2016 at 10:23, Red <adacy...@gmail.com> wrote:

Dear all,

I met a problem when I run spatial lag model (SLM) and spatial error model (SEM).

I use point shape file, and I can create continuity based  weights matrix also distance based  weights matrix.

But when I run SLM &SEM, I can't choose distance based  weights matrix as the spatial weights.

GeoDa always shows that "only symmetric can run the model.....", but I can use continuity based  weights matrix run SLM &SEM.

I don't know how to slove this problem.

Has anyone met the similar problem before? How can I solve this problem. 

Thank you!!

Red

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************************
Julia Koschinsky, Ph.D.
Research Director
Associate Research Professor
Arizona State University
School of Geographical Sciences and Urban Planning
GeoDa Center for Geospatial Analysis and Computation
julia.ko...@asu.edu

http://geodacenter.asu.edu
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[Red]

Hi, Julia

I have downloaded GeoDaSpace from your link.

I would like to ask that when running SLM &SEM with asymmetric/KNN weights, is GMM method the only option I can choose? There is "Spatial Lag+Error" in GeoDaSpace, What is this? 

Furthermore, it seems GeoDa can transform point shape file to polygons(as figure 1 I captured from a work book). I am using Geoda version 1.8.2 but the option isn't there (as figure 2). Is the function deprecated?

Thank you so much! 

figure 1

figure2

Red

Julia Koschinsky於 2016年5月9日星期一 UTC+8上午7時50分49秒寫道：