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st: svy commands


From   "Theodoropoulos, N." <nt18@leicester.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: svy commands
Date   Mon, 21 Oct 2002 19:46:22 +0100

Dear statalisters,

I am using the survey commands in Stata to find some means. I have removed all the stratums in which one psu (primary sampling unit) is detected. I check that there is no stratum with one psu for all my variables by using the svydes command. 
I don't have problems to get the invididual means for the individual variables "general" and "producti". However when i want to find the mean of the "general" variable given that "producti" variable is equal to zero i get the message that a stratum with one psu is detected. The "general" variable is continuous, and the "producti" variable is binary. 
Any hints will be highly appreciated.
Thanks in advance.

Here is a copy of the output that i get.    

 svymean general

Survey mean estimation

pweight:  empwt_nr                                Number of obs    =      1727
Strata:   newstr1                                 Number of strata =        44
PSU:      newpsu1                                 Number of PSUs   =       162
                                                  Population size  = 1200.4609

------------------------------------------------------------------------------
    Mean |   Estimate    Std. Err.   [95% Conf. Interval]        Deff
---------+--------------------------------------------------------------------
 general |   4.156863    .0044976    4.147957     4.16577    2.432631
------------------------------------------------------------------------------

. svymean producti

Survey mean estimation

pweight:  empwt_nr                                Number of obs    =      1727
Strata:   newstr1                                 Number of strata =        44
PSU:      newpsu1                                 Number of PSUs   =       162
                                                  Population size  = 1200.4609

------------------------------------------------------------------------------
    Mean |   Estimate    Std. Err.   [95% Conf. Interval]        Deff
---------+--------------------------------------------------------------------
producti |   .3359512    .0475784    .2417331    .4301693    17.51394
------------------------------------------------------------------------------

. svymean general if producti==0
stratum with only one PSU detected
r(460);   
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