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st: Re: -mean- with weights


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: -mean- with weights
Date   Mon, 10 Nov 2008 22:36:39 +0100

Because the default for the weights that you invoke with [w=...] is not the same, "analytic" for -reg- and "frequency" for -mean-

HTH
Martin
_______________________
----- Original Message ----- From: "Rodrigo Alfaro A." <ralfaro@bcentral.cl>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, November 10, 2008 10:30 PM
Subject: st: -mean- with weights


///

Hi,

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

Thanks for your time,
Rodrigo.

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