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st: subpop with svy commands


From   "Ritesh Mistry" <riteshm@ucla.edu>
To   "statalist" <statalist@hsphsun2.harvard.edu>
Subject   st: subpop with svy commands
Date   Tue, 30 Sep 2003 18:40:28 -0700

hello statalisters,

i am using survey procedures to analyze data, and need to select a subsample
on which to conduct all my analysis.  i understand that the subpop option
needs to be used and i have to create a variable which identifies the
subsample.  i have done this but something unexpected happens.

one criteria for exclusion from the subsample are responses that i am not
interested in for certain variables (e.g. for variable A there are 4 [1, 2,
3, 4] categories, but i am only interested in those that responded either 1
and 2). Although the variable indicating the subsample correctly identifies
only those that responded 1 or 2, when i run any analysis using the subpop
command (e.g. in svytab), i get a table with cells for all four categories,
and the cells for categories 3 & 4 are empty.  what i expected was to get a
table with cells for only categories 1 and 2.

any advice on how to deal with this.

as an alternative i designated categories 3 and 4 as missing so they would
not be included in the analysis, but this creates another problem: the
sample size becomes small enough so that there are some strata with only one
PSU (this requires that i combine strata, which i really don't want to do
but may have too).  is it appropriate to designate categories 3 and 4 as
missing?

i am sure i am missing something.

thanks!!

ritesh

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