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From |
Cielo Magno <cielomagno@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: correct command for nlogit and constraints |

Date |
Sat, 17 Oct 2009 16:23:58 -0400 |

Hello everyone, I have a question on nlogit and constraints. I have 2 nests with only 1 alternative. Thus, when I ran the -nlogit-, I got the following result. . nlogit choice price2 ndays Mtotal_ads||type: sex age, base (generic)||prescribe:, nolog notree noconstant case(id) note: branch 1 of level 1 is degenerate and the associated dissimilarity parameter ([generic_tau]_cons) is not defined; see help nlogit for details note: branch 2 of level 1 is degenerate and the associated dissimilarity parameter ([breakthrough_tau]_cons) is not defined; see help nlogit for details. I tried to follow the instruction in the help by running the following. But it did not work. . constraint 1 [breakthrough_tau]_cons = 1 . constraint 2 [generic_tau]_cons = 1 . nlogit choice price2 ndays Mtotal_ads||type: sex age, base (generic)||prescribe:, nolog notree noconstant case(id) constraint (1 2) option constraint() not allowed equation 3 defining level 2 is improperly specified r(198); . nlogit choice price2 ndays Mtotal_ads||type: sex age, base (generic)||prescribe:, nolog notree noconstant case(id) constraint (1) constraint (2) option constraint() not allowed equation 3 defining level 2 is improperly specified r(198); Would anyone have any suggestion on how specify -nlogit- when you have 2 constraints? Any help will be appreciated. Cielo Magno * * 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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