st: get robust SE and adjust for samling design

["HUANG, LILING" <huangl@email.sc.edu>]

Dear Statalist,

Since option vce() of poisson is not allowed with the svy prefix, I tried running a regular poisson regression with [pw=sampwgt], vce(cluster psu) to get robust standard errors. 

I need to adjust for strata as well. Does anyone know how I can specify it in the syntax?
. poisson x y z [pw=pwt], vce(cluster psu1)

Here are my original svy syntax.  
svyset [pweight=pwt], strata(strata) psu(psu1)
. svy:poisson x y z
(running poisson on estimation sample)
Survey: Poisson regression
Number of strata   =         6                  Number of obs      =      1986
Number of PSUs     =        61                  Population size    = 1934.5412
                                                Design df          =        55
                                                F(   2,     54)    =     86.34
                                                Prob > F           =    0.0000
------------------------------------------------------------------------------
              |             Linearized
           x |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
          y |   .2246702   .0172226    13.05   0.000     .1901554    .2591849
          z |   .0017301   .0356631     0.05   0.961    -.0697404    .0732006
       _cons |   .2436516   .0499279     4.88   0.000     .1435939    .3437094
------------------------------------------------------------------------------

Thanks,

Liling Huang

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