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From |
Simon Coulombe <simoncoulombe@gmail.com> |

To |
statalist <statalist@hsphsun2.harvard.edu> |

Subject |
st: How to perform a -clogit- on a choice-based AND exogeneously stratified sample |

Date |
Tue, 24 Mar 2009 10:25:17 -0400 |

Dear Statalist, I am currently trying to perform a -clogit- on a stratified sample. The stratification is both choice-based and exogenous, as the persons running the survey wanted to have the same amount of persons for each *options* and for each *area*. For example, suppose that in real life there are 10 persons in Region A using option 1 20 persons in Region A using option 2 30 persons in Region A using option 3 150 persons in Region B using option 1 250 persons in Region B using option 2 350 persons in Region B using option 3 then my sample will look like this: 5 persons in Region A using option 1 5 persons in Region A using option 2 5 persons in Region A using option 3 5 persons in Region B using option 1 5 persons in Region B using option 2 5 persons in Region B using option 3 How would you correct the clogit estimates to take this into account? I know from chapter 8 "Discrete Choice Analysis : Theory and Application to Travel Demand" written in 1985 by Ben-Akiva & Lerman that only the intercept will be affected in a choice-based sample and that I can correct it easily. I am not sure what to do with the exogeneous part though. Can stata handle this? Thanks, Simon * * 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/

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