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Re: st: STATA and NHIS weight variables


From   sjsamuels@gmail.com
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: STATA and NHIS weight variables
Date   Mon, 20 Jul 2009 12:59:12 -0400

--

Welcome to Stata!  If you look up the -svyset- command, you will
discover there is no "psu()" option.  The help will show you the
correct command.   Are you sure that all the 98,000 odd people with
"wtfa" weights defined are adults?   The _merge variable produced by
Stata's -merge- command will tell you source file for each merged
observation.  (I recommend -mmerge- ("ssc install mmerge"), an
enhanced version of -merge-. )  In any case, you will need a very good
reason to ignore the advice in the documentation.

Good luck!

-Steve


On Mon, Jul 20, 2009 at 12:07 PM, Michael
Drazer<michaeldrazer@uchicago.edu> wrote:
> Hello,
>
> I am new to STATA and am doing some work with a dataset that I created by
> merging together the 2005 sample adult, person, and sample adult cancer NHIS
> datasets. I'm trying to construct an appropriate survey design statement,
> but am not sure how to properly define the pweights for my dataset.
>
> According to the Sample Adult variable layout, the wtfa_sa weight should be
> used for most sample adult analyses - I noticed, however, that the Sample
> Adult dataset also has values for the wtfa weight. All of the 98,649
> observations in my merged dataset have wtfa weights, but only those 31,428
> observations in the sample adult/sample adult cancer datasets contain
> wtfa_sa weights. My question is: to properly weigh this data, should I use a
> standard survey design statement, such as:
>
> svyset [pweight=wtfa],strata(stratum)psu(psu)
>
> even though it does not take into account the wtfa_sa weights, or is there a
> better way to weigh this data?
>
> For additional info re: variable layouts in the NHIS data, see here (the
> Variable layout PDFs are informative in terms of a description of the wtfa
> and wtfa_sa variables - see the person layout for wtfa and either the sample
> adult or sample adult cancer layout for the wtfa_sa variable):
> http://www.cdc.gov/nchs/nhis/nhis_2005_data_release.htm
>
Steven Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
845-246-0774
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