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st: STATA and NHIS weight variables


From   Michael Drazer <michaeldrazer@uchicago.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: STATA and NHIS weight variables
Date   Mon, 20 Jul 2009 11:07:35 -0500

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

Thanks in advance,

Michael


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