Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: Re: using sample weights in the absence of stratification andclustering


From   frone@ria.buffalo.edu
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: using sample weights in the absence of stratification andclustering
Date   Mon, 18 Aug 2003 13:37:35 -0400

Scott,

Thanks much.  I guess I'll have to look through the manuals more carefully 
next time.

Mike Frone





"Scott Merryman" <smerryman@kc.rr.com>
Sent by: owner-statalist@hsphsun2.harvard.edu
08/14/03 08:53 PM
Please respond to statalist

 
        To:     <statalist@hsphsun2.harvard.edu>
        cc: 
        Subject:        st: Re: using sample weights in the absence of stratification and 
clustering

----- Original Message -----
From: frone@ria.buffalo.edu
Subject: st: using sample weights in the absence of stratification and
clustering
Date: Wed, 13 Aug 2003 19:00:18 -0400

> I would be grateful if someone could help me understand the basic issue
> involved in using sampling weights in the absence of stratification and
> clustering.

> If I compute the weighted mean and standard error of a variable in
> SPSS(using the sample weight)  or in Stata using -ci- and aweights, I 
get
> the same estimates for the weighted mean and standard error.  However, 
if
> I use -svymean- with pweights, I get the same estimate for the weighted
> mean, but the standard error is different.  There is a note on page 350 
of
> [U] stating the standard error provided by SPSS or -ci- with aweights is
> not correct.  I'm not sure why.

<snip>

There is a discussion of weighted estimation at [U] 23.16 and in 
particular
[U]23.16.3.
aweighted estimation interprets larger weights to mean the data is more
accurately measured - pweights do not make this assumption.

Hope this helps,
Scott


*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index