Re: st: national survey with complex sample design

[Steven Samuels <ssamuels@albany.edu>]

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


On Feb 8, 2007, at 1:22 PM, Austin Nichols wrote:

Hillel Alpert --
Stata should work fine, assuming your stratum and psu codes do not
overlap across years (I assume you are discussing repeated cross
sections, not panel data).  If they do, you will want to redefine svy
variables by appending the year to the stratum and psu codes, e.g.
 svyset
 egen newstrata=group(`r(strata1)' year)
 egen newpsu=group(`r(su1)' year)
 svyset newpsu [pw=`r(wvar)'], strata(newstrata)
The weights should be appropriate without adjustment, I think.

On 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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