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Re: st: Mills ratio after bivariate probit


From   Sami Haile <samex_zegr8@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mills ratio after bivariate probit
Date   Fri, 14 Nov 2008 08:56:37 -0800 (PST)

hi Friedrich and shehzad
Thanks for the suggestions. To make my problem clrear, here is the way my model look

Y1=sellers     Y2=buyers
biprobit y1 y2 x1 x2 x3 x4 (pw=weight)

Here I want to eastimate two selection parameters for both regimes, so that I can use them in the second step which is weighted two stage least square. I want to use this selection parameters as an instrumental variables in my second model, which looks like;
ivreg  y1  x1 x2 (invmills1 = x4 x5) [pweight = weight)
ivreg  y2 x1 x2  (invmills2=x4 x5) [pweight = weight)

Invers mills here is the selection parameter from the biprobit, which considers the factors that affect the decision to sell and/or buy - in this case x3 x4 . This is what I thought if i am right, So I hope I made the problem clear now.

thanks for your time and suggestion again.
sami


      

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