0502/date/article-795.html
Let me answer some of my own questions. I'll truncate them into
separate email for brevity. ;)
> 2. -mfx- is able to compute the marginal effects of the first
> specification (with standard errors, too). However, when I try it on
> the constrained -biprobit-, it responds with
> "warning: derivative missing; try rescaling variable p".
> How could this happen?
http://www.stata.com/support/faqs/stat/mfx_scale.html
I tried this method a few times but it didn't solve the problem. The
crucial question for me, though, is why -mfx- fails with constraints
(setting the coefficient of one independent variable to zero) but is
successful when simply deleting the variable from the equation.
--
Paloys
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