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st: Multilevel selection models using gllamm
I am trying to use gllamm for multilevel Heckman selection model, but I am stuck which I have problem to specify the constraints;
I use command;
Constraint define 1 [id1]il=1 (as stated in the note by Sophia) but stata not recognise the variable id1.
Could anyone help me, I have note of stata user group meeting at Maastricht, but I could not understand how it work.
Centre for applied statistics
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