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From |
Abdurrahman.Aydemir@statcan.ca |

To |
statalist@hsphsun2.harvard.edu |

Subject |
RE: st: sample selection with bivariate probit |

Date |
Thu, 26 Sep 2002 14:06:28 -0400 |

Erik, thanks for you reply. Here the parameters of interest are the parameters of the earnings equation. The context is international migration. z=1 refers to migrants, z=0 refers to non-migrants. What I need is sample selectivity corrected returns to characteristics in the lnw equation. In the data I observe lnw for a given individual either for z=1 or z=0, but not for both (previous message is misleading - sorry ). I.e. for those who migrate I only observe lnw|z=1 and for non-migrants I only observe lnw|z=0. I want to predict the earnings of a migrant had that individual not migrated ( and vice versa for non-migrants). Given returns to characteristics of the same individual can be different in the host country and in the source country I want to estimate the model separately for z=1 and z=0, and use the estimated coefficients for my prediction. >-----Original Message----- >From: Erik Ø. Sørensen [mailto:sameos@mac.com] >Sent: Thursday, September 26, 2002 1:32 PM >To: Abdurrahman.Aydemir@statcan.ca >Subject: Re: st: sample selection with bivariate probit > > >On torsdag, sep 26, 2002, at 13:07 America/Montreal, >Abdurrahman.Aydemir@statcan.ca wrote: > >> Dear Users, >> >> I am estimating a log earnings equation controlling for >selection. The >> selection involves two stages that leads to a bivariate probit with >> partial >> observability. >> >> lnw=x3b3+e3 observed for z=1 and z=0 >> >> where z=y1 x y2; z=1 iff y1=y2=1; z=0 if y1=0 or y2=0 > >I think you need to explain more carefully what is observed, what is >not observed and what is the parameters of interest. If you get to >observe lnw=x3b3+e3 no matter what is the value of z, why do you want >to estimate it seperately for the values of z? Why would this make a >difference? > >Erik >-- >Erik Ø. Sørensen, <http://www.geocities.com/erik_oiolf/> > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: sample selection with bivariate probit***From:*"DL Millimet" <millimet@post.cis.smu.edu>

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