st: probit & endogeneity

[Fufang Zhang <zhangfufang@gmail.com>]

Good Day!

I have a system of equations:

y1= y2 +x1+x2+x3
y2= y1+ x2+x3+x4

- all the Ys and Xs are binary.

My question is, what is the appropriate command to estimate the
system? My understanding is that, I should not use biprobit because y1
and y2 are mutually-determined.

Thanks a lot.
Fufang
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