Re: st: double clustering

[Steven Samuels <sjhsamuels@earthlink.net>]

Or:  treat country as a stratum variable and -svyset- your data. You  
may add country-level factors and interactions in either approach.   
You don't tell us why you want to pool, so I cannot recommend one  
approach over the other.

On May 31, 2008, at 1:17 PM, Jeph Herrin wrote:


> See -xtmixed- and -xtmelogit-.
>
> Orsetta.CAUSA@oecd.org wrote:
> > Hello
> > I am running country-by-country regressions on a sample of  
> > students, that are
> > clustered in schools. I cluster at the school level. Now, if I  
> > want to pool
> > the countries, I still need to take school cluster into account,  
> > but I would
> > like to also cluster at the country level. I know that stata  
> > allows double
> > stage sampling in svy, but I don't think it is correct to consider  
> > the
> > country as the psu (and the school would be the ssu), because a  
> > country is
> > not a sampling unit since it is sampled with certainty. I remember  
> > having noticed in some old statalist archive that there is a
> > user-written double clustering option available (ideally one would  
> > want to
> > explicit the robust cluster option followed by 2 variables). does  
> > anybody has
> > a clue on it? What would you suggest to do? (not considering gllam  
> > modeling
> > since my programs are far too long and heavy and would not run in  
> > a gllam
> > configuration). Many thanks :)
> > orsetta
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