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st: Chi square test unavailable when subpop is used in svy analyisis


From   "Ángel Rodríguez Laso" <angelrlaso@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Chi square test unavailable when subpop is used in svy analyisis
Date   Mon, 18 Aug 2008 12:20:16 +0200

Dear Statalisters,

I'm working with Stata 9.2.

I'm interested in obtaining the corrected chi square test for a
distribution of two variables from a survey ('p108_n' and 'sexo'), but
limiting the analysis to a selected group of values  of p108_n (1 to
5). I've used the subpop command with the following result:


 svy, subpop(if p108_n<10):tab p108_n sexo , count nolabel format(%11.1f)
(running tabulate on estimation sample)

Number of strata   =        11                  Number of obs      =     12190
Number of PSUs     =      1266                  Population size    = 12189,962
                                                Subpop. no. of obs =     11733
                                                Subpop. size       = 11834,102
                                                Design df          =      1255

----------------------------------
          |          sexo
   p108_n |      1       2   Total
----------+-----------------------
        1 |  638,8   708,1  1346,9
        2 |  581,3   726,2  1307,5
        3 | 1968,3  2144,6  4112,9
        4 | 2215,6  1926,3  4141,9
        5 |  404,2   520,7   924,9
       10 |    0,0     0,0     0,0
          |
    Total | 5808,2  6025,9  11834,1
----------------------------------
  Key:  weighted counts

  Table contains a zero in the marginals.
  Statistics cannot be computed.


Is there any way to get the chi square test I need without deleting
the p108_n==10 individuals, I mean, keeping them for the calculation
of the standard errors?

Many thanks.

Ángel Rodríguez Laso

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