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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: ZOIB procedure |
| Date | Mon, 19 Sep 2011 13:58:21 +0200 |
On Mon, Sep 19, 2011 at 1:01 PM, Prerna S wrote: > With respect to dirifit, I > interpreted it as being similar to betafit in that it does not handle > '0' and '1' very well. -dirifit- handles zeros and ones in the same way as -betafit-, whether that is well or not well depends on your problem. > Both dirifit and fmlogit, moreover, do not > handle the sample selection problem like zoib. That depends on what you think the sample selection problem is in your case. In general I would not think of -zoib- as a solution for a sample selection problem, as that typically implies a correlation between the errors of the selection equation and the main equation and no such correlation is implied or estimated in -zoib-. 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/