Michael and Sara--
The point estimates obtained using [aweights] and [pweights] are in
most cases identical, but the standard errors are not. In short,
[pweights]=[aweights]+_robust (see -help _robust-). Sometimes you can
use aweights and bootstrap standard errors when pweights are not
allowed. See also:
http://www.stata.com/support/faqs/stat/supweight.html
However, -xtreg- with the -re- option allows no weights, and with the
-mle-option takes only [iweights]. It may be possible to specify your
pweights as [iw=pweights] but inference is a trickier business, I
suspect.
On 10/31/06, [email protected] <[email protected]> wrote:
I dont know if this is econometrically sound, but I've used aweights with
a random effects model and haven't had a problem. Several times I've
compared results using aweights and pweights and have not found much difference if any.
"Sara Bleich" <[email protected]>
Does anyone know of a command that allows you to use pweights with a random effect model? Xtreg does not, but is there another command that does?
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