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Re: st: ssm wrapper and population weights


From   A Das <kerbo2004@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: ssm wrapper and population weights
Date   Fri, 29 Sep 2006 10:32:22 -0700 (PDT)

Thanks, Anders. Yes, I meant sampling weights. This is
what happens when I do as you suggest-

. ssm emoprobb age harassd puberty11 firstvi ktouch
usborn2 [pweight=rweight], s(harassd = age edimp
milserved) adapt q(16) family(binom) link(logit)
commands

*-------------------------------begin
do-file-----------------------------------

* Select sample

mark touse   [pweight= rweight]
markout touse emoprobb

gen long wgt = rweight
* deal with probability weights

gen _pwt2 = wgt
; invalid name
r(198);

So a problem with the underlying glamm code, then?
Thanks again. 
               -Aniruddha Das.



--- Anders Alexandersson <andersalex@gmail.com> wrote:

> On 9/28/06, A Das <kerbo2004@yahoo.com> wrote:
> >    I'm trying to use the new ssm wrapper (Stata
> > Journal (2006), 6, 3, pp. 285-308) to fit a logit
> > model with a single endogenous dummy. The model
> does
> > not work when I include population weights
> (although
> > it should: p.292), but works when I do not. Here's
> the
> > model and the error message:
> >
> >
> > ssm emoprobb age harassd puberty11 firstvi ktouch
> > usborn2 if xf==1 [pweight=rweight], s(harassd =
> age
> > edimp milserved) adapt q(16)  family(binom)
> > link(logit)
> >
> > ; invalid name
> > r(198);
> >
> > Again, the same model runs properly when I remove
> the
> > population weights. Any help would be greatly
> > appreciated.
> 
> With "population weights" I assume you mean sampling
> weights, since
> you refer to pweight. I remember that gllamm instead
> assumes
> pweight(varname) but that's maybe irrelevant here.
> Is your gllammm
> installation up-to-date? To have more control of
> what's going, I would
> make a backup copy of the original dataset, then use
> the commands
> option, as described in section 6.4 of the article.
> If you still get
> an error message, at least you will now if the error
> message is for
> the underlying gllamm code or for the commands
> before gllamm is
> called.
> 
> More generally, it is a good idea to debug a
> problematic command with
> -set trace on- beforing issuing the command; see the
> FAQ at
> http://www.stata.com/support/faqs/lang/debug.html.
> 
> Anders Alexandersson
> andersalex@gmail.com
> *
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> 


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