How to caltulate the average marginal effects of bioprobit?

[Yingmin Wei]

Hello everyone,

I have a problem about the average marginal effects of bioprobit. I'll appreciate it if you have any advice.

**I ran the bioprobit as follow:

bioprobit (conv=SC KOD KOT PROX SIZE AGE MHT KI) (cm=SC KOD KOT PROX SIZE AGE MHT KI), robust

***then I calculate the average marginal effects:

margins, dydx(*) predict(eq(#1)) atmeans
margins, dydx(*) predict(eq(#2)) atmeans

The problem is that the results of margins are the same as the coefficients of bioprobit, which makes me confused. Is it reasonable?
Are there any mistakes in the margins command?

Thanks in advance!

Regards,
Yingmin