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st: error message in treatreg2 predict

From   Xiang Bi <>
Subject   st: error message in treatreg2 predict
Date   Wed, 26 May 2010 13:18:00 -0500

Dear Statalister,

I am running the following example on treagreg2 from

net from

I run the example do file:, but i can not compute mfx
or predict after the estimation

The error message for both mfx, force and predict is: "equation lnalpha not

Any idea how i can deal with it?

Thank you very much!


Bi, Xiang
PhD Candidate & Research Assistant
Agricultural and Consumer Economics
University of Illinois, Urbana Champaign
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