st: marginal effects after ivprobit

["Gandelman, Nestor" <gandelman@ort.edu.uy>]

Hello statalisters,
I'm using the ivprobit command to estimate probit model with one 
endogenous regressor.
The mfx (and mfx2) packages reported marginal effects are the same as 
the output coefficients.
This seems not to be right or I'm missing something?
Best, Nestor
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