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RE: st: -mean- with weights


From   "Rodrigo Alfaro A." <ralfaro@bcentral.cl>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: -mean- with weights
Date   Tue, 11 Nov 2008 10:36:52 -0300

///

Thanks to Maarten, Martin, and Thomas!

 

-----Mensaje original-----
De: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] En nombre de Maarten buis
Enviado el: Lunes, 10 de Noviembre de 2008 06:46 p.m.
Para: statalist@hsphsun2.harvard.edu
Asunto: Re: st: -mean- with weights

--- "Rodrigo Alfaro A." <ralfaro@bcentral.cl> 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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