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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Heckman |

Date |
Thu, 4 Oct 2012 16:42:00 +0200 |

You posted the same question earlier today. Please be more patient. There are many reasons for why you do not get a response immediately: Many set some time aside, typically at the beginning or end of the work day, on which they answer questions to Statalist. This is a very sensible strategy for them; that way they can get the work for which they are paid done. However, that does mean that you'll just have to wait. Even those that do not follow that very sensible strategy will reserve some time for sleeping, eating and the like. The usual hours for these activities tend to depend on once time zone... Some people cannot answer or just don't want to answer this question. None of this is going to change by repeating exactly the same question within a few hours. However, this is going to annoy some people on this list, because it showed that you did not read the Statalist FAQ < http://www.stata.com/support/faqs/resources/statalist-faq/> before posting to the list. -- Maarten On Thu, Oct 4, 2012 at 4:21 PM, Jan Wynen <Jan.Wynen@kuleuven.be> wrote: > Dear, > > I am trying to run the following Heckman procedure whereby; > > I have following selection equation: > > z= x1+x2+x3 +v > > whereby v is the error term > > and following structural equation: > > y=x1+x2++z1+z2+z3+e > > whereby e is the error term > > z1, z2 and z3 are variables that affect only y (structural equation) and not z (selection). They are only observed when z=1. > > Is this a good approach? Or will z1, z2 and z3 be endogenous (will they not be independent of the error term of the selection equation)? > > Any help would be much appreciated! > > Best, > > Jan > > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ -- --------------------------------- Maarten L. Buis WZB Reichpietschufer 50 10785 Berlin Germany http://www.maartenbuis.nl --------------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Heckman***From:*Jan Wynen <Jan.Wynen@kuleuven.be>

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