st: Svytab subgroup analysis with more than two subgroups

["L Allen" <indiananonprofit@hotmail.com>]

Dear Statalist,

We have survey data with 39 strata.  We have categorized the respondents 
into 6 groups. This grouping was not used in the sampling design (it is not 
one of our stratifying variables).  We want to do a svytab on 3 of the 6 
groups against responses to a categorical variable; however, the survey 
manual warns us not to us an if restriction to select these three groups 
because it will not produce correct statistics and variance estimates.  
However, the subpop() option does  not appear to meet our needs either 
because we want to test the association among these three groups.  Any 
suggestions on how to proceed would be appreciated.

Richard Clerkin
Ph.D. Student
Indiana Nonprofit Project
Indiana University-Bloomington

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