st: Probit and Marginal Effects

[<Kristina.L.Minnick@frb.gov>]

I have run into an unusual scenario, and was wondering if someone has an
explanation.  Say that I run a probit estimate on
the following:

Gender = a + b1SIZE +b2AGE +b3DUMMY

why would the dummy variable be significant in the probit estimate, but not
in the marginal effects estimate?

Thank you,

Kristi

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