Re: st: xtlogit is slow

[David Airey <david.airey@vanderbilt.edu>]

.

Oops, sorry this only a problem when "if" is placed in a loop, and you  
are not doing this.

-Dave

On Jul 7, 2008, at 9:06 AM, David Airey wrote:


> .
>
> Does dropping the data to the estimation sample and removing the  
> "if" change the timing? There has been a lot of discussion about  
> "if" slowing Stata down. I doubt this is your problem.
>
> -Dave
>
> On Jul 7, 2008, at 8:54 AM, Mitchell F. Berman wrote:
>
>
> > Thank you for the information that changing the integration points  
> > won't help; I won't bother investigating that.
> >
> > The call to xtlogit that I'm using is:
> >
> > xi: xtlogit depvar i.catvar1 other_vars if rand <7, pa c(exc)
> >
> > the c(exc) option is unnecessary--- xtlogit ..., pa is equivalent to
> > xtgee ..., family(binomial) link(logit) corr(exchangeable)
> >
> > I can't see what else I'm doing wrong, especially since the  
> > identical data set runs quickly in SAS with results identical to  
> > stata.  I'm guessing that the numeric method SAS uses for genmod is  
> > just faster than whatever Stata is using for xtgee.
> >
> > Mitchell Berman
> > Columbia University
> >
> >
> >
> >
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