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| From | Maarten buis <maartenbuis@yahoo.co.uk> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Different selection variables for different subpopulations in the sample |
| Date | Sun, 17 Apr 2011 16:16:19 +0100 (BST) |
--- On Sun, 17/4/11, Dimitrije Tišma wrote: > I was wondering if there exists some Stata command which > would allow me to select different selection variables when > working with Heckman selection models. For instance, let's > say I am working with the textbook example of wages. I may > assume that number of kids is the variable that determines > selection of women into employment, while some other > variable would be selection variable for men. Or, > alternatively, I could assume that there is selection bias > only for women, while no selection is at work for the other > part of the sample. I would just add interaction terms between a female indicator variable and relevant other variables in your selection equation, i.e. I would not expect the number of children to have the same effect on the probability of working for men and women. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/