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Re: st: national survey with complex sample design


From   Steven Samuels <ssamuels@albany.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: national survey with complex sample design
Date   Thu, 8 Feb 2007 14:57:30 -0500

Some other thoughts. Ordinarily the first-level strata will be geographic in a single year, so that "YEAR-GEOGRAPHIC STRATUM" will be the highest level stratum. If PSU's are selected within a YEAR, there may be independent subsampling in subsequent years. Thus in some surveys, there may be multiple "year" substrata within the first level strata.

My point is that Stata can handle these complications as well, if not better than, SUDAAN. Stata, but not SUDAAN, can do sample raking of weights to known population totals on multiple control variables, thanks to Nick Winter's fine -survwgt- package.

Steve

On Feb 8, 2007, at 2:03 PM, Steven Samuels wrote:

I think that Stata will also work if strata & PSU's do overlap years. For example: ordinarily "YEAR" would be a first-level stratum and PSU's would be sampled independently within a year. However if a PSU sampled in one year is re-used for subsequent years, then the YEAR of PSU selection would still be the highest level stratum, but the year in which the observation is made would be the one to use for the analysis of time trends.


Steve


OOn 2/8/07, Hillel Alpert <HALPERT@hsph.harvard.edu> wrote:

Could someone please advise whether and how Stata can handle national survey data with multiple years and complex survey sample design?

A single year data can readily be handled in Stata based on the weight and strata variable. Can we analyze the appended data over two or more years the same way, or is a program such as SUDAAN needed? The analysis will be of time trends, and we assume the sampling was not identical from year to year.

Hillel Alpert
halpert@hsph.harvard.edu
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