st: Multinomial regression with sample selection

[Christer Thrane <lineea@broadpark.no>]

Hi,

Since my dep var of main interest (Y2) have three alternatives for a 
selected sample (if there were two alternatives, I would have 
used -heckprob-), I wonder it the following procedure is OK:

1. probit Y1 x1 x2 z1 z2  //the selection equation//

2. generate the Inverse Mills' Ratio, IMR

3. mlogit Y2 x1 x2 x3 x4 z3 IMR, rob //the main equation//

BR,

Christer

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