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st: using biprobit

From   "Henrique Neder" <[email protected]>
To   <[email protected]>
Subject   st: using biprobit
Date   Mon, 10 Dec 2007 16:14:23 -0200

Dear all

I'm using the biprobit command to evaluate the impact of a income
transference program on a food insurance indicator. I have to equations:

svy linearized : biprobit fomegra benef
idade anosest d_sexo d_cor
d_sabeler d_matpar d_matcob numpescom d_agua d_banheiro numban d_lixo
rendapc  _Iregiao_2 _Iregiao_3 _Iregiao_4 _Iregiao_5                 
The dependent variables in the two equations are  fomegra (the food
insurance indicator, a dummy variable) and benef (a dummy variable that
indicates the program participation). My intention is eliminate the bias due
to the fact that impact variable (benef) is endogenous because I think that
benef and fomegra are simultaneously determined.    

STATA returns the following message:

(running biprobit on estimation sample)
initial values not feasible
an error occurred when svy executed biprobit

How can I solve this?
Thanks in advance

Henrique Neder

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