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Re: st: double clustering


From   Steven Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: double clustering
Date   Sat, 31 May 2008 13:34:20 -0400

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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