[R] Re: Subpopulations in Complex Surveys

[Thomas Lumley]

On Wed, 19 Feb 2003 TyagiAnupam at aol.com wrote:

> Hi,
> is there a way to analyze subpopulations (e.g. women over 50, those who
> answered "yes" to a particular question) in a survey using Survey package?
> Other packages (e.g. Stata, SUDAAN) do this with a subpopulation option to
> identify the subpopulation for which the analysis shoud be done. I did not
> see this option in the Survey package. Is there another way to do this?
>

Ok, there is a new version of survey (1.1) that will appear on CRAN over
the next few days that handles subsets as subpopulations in the sense used
by Stata.   There is a function subset.survey.design that makes it easy to
select subsets, eg
    black<-subset(dnhanes, race==1)
but subsets resulting from dropping NAs or from the subset argument to
svyglm or svycoxph are handled the same way.


	-thomas

Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle