st: Three simulateneous equations - one being logit

["Wiemann, Markus" <m.wiemann@fs.de>]

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Hello,

I am trying to run a 3SLS (with seemingly unrelated regressions) in the
following form:
First stage: y1_binary x1 x2 x3 
Second stage: y2 x4 x5 x6 dummy_for_y1
Third stage: y3 x1 x4 x7 dummy_for_y1

I thought I might use - reg3 - to run these regressions. But I am not
sure whether I run into trouble because of the first stage being binary.
I did not find a way to define the binary outcome and hence use an
according model like logit/probit in the first stage. 

Is it indeed a problem to have a binary in outcome in -reg3-? Is there a
better model for my approach? Like, for example, using Inverse Mills'
Ratios from Heckman in a simultaneous equation model? 
Do I face the same problems using 2SLS?

I use Stata/SE 10.0



Thanks in advance
Markus 


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