Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: svy + aweights
From
Jeph Herrin <[email protected]>
To
[email protected]
Subject
Re: st: svy + aweights
Date
Thu, 10 Nov 2011 16:48:00 -0500
I'm not sure I get this. How can correlations at one level be "engulfed"
by correlations at another? The PSUs account for subject level correlation,
but for each subject I have multiple observations.
Moreover, if I -reshape-, does it still make sense to -svyset psu-? I thought
not.
On 11/10/2011 4:40 PM, Stas Kolenikov wrote:
On Thu, Nov 10, 2011 at 4:01 PM, JH<[email protected]> wrote:
But doesn't your suggestion ignore the correlation of observations within
subjects?
No. Unless your current -svyset-ting is -svyset _n-... and frankly I
don't know how that would behave with -reshape-. If you have PSUs in
your -svyset- (and NHANES does have them), then the correlations of
observations within the subjects will be engulfed by the correlations
of observations within the PSUs that -svy:- controls for.
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/