Look at your output... -mean- assumes frequency weights; -reg- assumes analytical weights when you say -[w=factor]-; they are not the same (use -[fw=factor]- or -[aw=factor]- and you should get similar results.
-----------------------------------
Thomas J. Steichen
[email protected]
-----------------------------------
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Rodrigo Alfaro A.
Sent: Monday, November 10, 2008 4:31 PM
To: [email protected]
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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