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| From | "Nakelse, Tebila (AfricaRice)" <T.Nakelse@cgiar.org> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | st: Margin with two step estimator. |
| Date | Thu, 2 Feb 2012 08:18:59 +0000 |
Dear Stata Users, I've estimated a two-step equations. The first step is a logit and the second one is E(Y| p,X)= a + bp + cx +... where p is the predicted probability of the first step. I want to use the margin command to have the predicted value of E(Y| p,X). But my problem is to tell to margin that I want him to predict p and after to predict E(Y| p,X) simultaneously. What I have tried to do is to stack the b and V matrix of the two steps and give it to margins as his b and V matrix and write the full equation to be calculated by margin using the b elements as coefficients. But the main problem is to access the coefficients of the b or the V matrix of stata. Please is someone can help me ? Tebila * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/