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st: -mean- with weights


From   "Rodrigo Alfaro A." <[email protected]>
To   <[email protected]>
Subject   st: -mean- with weights
Date   Mon, 10 Nov 2008 18:30:47 -0300

///

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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