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Re: st: RE: geographically weighted regression


From   wangxin <xwang757@yahoo.com.cn>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: geographically weighted regression
Date   Wed, 29 Oct 2008 12:22:20 -0700 (PDT)

Hi, all:

Can GWR deal with Poisson Regression? since My
dependent is a count number.
In the help gwr, there is a script:
gwr flag class unemp, east(east) north(north)
fam(binomial) link(logit)

Does this mean a GW logit regression? I am a little
confused about this. Any advice is welcome.

-Fiona

--- Nick Cox <n.j.cox@durham.ac.uk> wrote:

> -gwr- was published in the Stata Technical Bulletin
> in 1998: 
> 
> STB-46  sg95  . . . . . . . . . . . . . . .
> Geographically weighted
> regression
>         (help gwr if installed) . . . . . . . . . .
> . . . . . . . M. S.
> Pearce
>         11/98   pp.20--24; STB Reprints Vol 8,
> pp.189--194
>         applies geographically weighted regression
> to a dataset
>         containing geographical reference points
> 
> I have not used it, but the implication that it is
> not well documented
> is a little misleading. The article above is freely
> available at the
> Stata website, regardless of whether you or your
> institution ever
> subscribed. See 
> 
> http://www.stata.com/products/stb/journals/stb46.pdf
> 
> Nor is there much mystery about st_0_0_1. You can
> look at the code
> within Stata by 
> 
> . viewsource gwr.ado 
> 
> and even without any need to be a Stata programmer
> see that this is the
> name of the data file being used to store results.
> (Nowadays a temporary
> file might well be used.) 
> 
> On your main point, I don't find it especially
> surprising that it is
> slow, as the thrust of the technique is to get an
> idea of spatial
> variability through repeated modelling, in your case
> thousands of times.
> In addition -gwr- could be speeded up a bit, and
> perhaps even a lot, by
> taking advantage of changes in Stata over the last
> decade, but that
> doesn't help you unless someone does it. 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> Helen Rosenkrantz
> 
> I am running a geographically weighted regression
> model in Stata with
> 3,019 observations and 5 variables. I am wondering
> if anyone might be
> able to help me since I have found little guidance
> available online
> regarding gwr in stata (aside from some information
> provided by the
> program creator and help function). It has been
> processing for over 24
> hours and seems to be updating an output dataset
> called "st_0_0_1".
> Included in this mystery dataset are numbers for the
> 5 vars and the
> constant.
> 
> Here is my syntax: gwr  depvar indvars,east( xcoo)
> north( ycoo)
> reps(1000) test saving(eb_gwr) outfile(eb_gwr)
> mcsave(mc_eb)
> 
> 
> Has anyone had success in using Stata for GWR?? Any
> help would be
> greatly appreciated! 
> 
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