///
Thanks to Maarten, Martin, and Thomas!
-----Mensaje original-----
De: [email protected]
[mailto:[email protected]] En nombre de Maarten buis
Enviado el: Lunes, 10 de Noviembre de 2008 06:46 p.m.
Para: [email protected]
Asunto: Re: st: -mean- with weights
--- "Rodrigo Alfaro A." <[email protected]> wrote:
> I found an weird outcome using -mean- with weights (versions 9 and
> 10). I just one to know the average with its SE. Using -mean- without
> weights I got the same mean and SE as using -reg-. However, when I
> used weights results are not same in terms of SE.
>
> sysuse auto
> set seed 1234
> gen tmp=uniform()
> gen factor=round(1/tmp,1)
> mean price
> mean price [w=factor]
> reg price, nohead
> reg price [w=factor], nohead
That is because the default weight-type differs between -regress-
(analytic weights or aweights) and
-mean- (frequency weights or fweights).
-- Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room N515
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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