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Re: st: Questions about svy commands


From   Steven Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Questions about svy commands
Date   Sun, 10 Feb 2008 09:56:24 -0500

On Feb 10, 2008, at 7:12 AM, Ana Gabriela Guerrero Serdan wrote:

They are difined by province but also by urban/rural.
So I would need to include dummies for urban areas as
well, I suppose?

If each province is split into urban/rural you have (no. strata)= (2 x no. provinces). You could use -xi- and include all strata with an i.urban*i.rural term. You might not need the interaction term. In that case, modify the degrees of freedom by subtracting only the number of interaction terms. If I = number of provinces, the number of interaction terms is I - 1.


Another issue is that I also run regressions for
different groups within my sub-sample of children. So
I have split children into 4 cohorts and in the areas
where they reside. So my regressions are a sub-sub of
the whole sample. This sounds confusing but the idea
is to use a diffs-diffs estimators. So I compare
cohorts in different areas.

You probably don't need other -subpop- statements. For example, if you are computing or comparing means for several cohorts, you could have:

svy, subpop(children): mean varx, over(cohort)

-Steven


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