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From |
Stas Kolenikov <skolenik@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: question on gllamm for discrete latent variable with one factor structure |

Date |
Mon, 10 May 2010 15:17:16 -0500 |

On Mon, May 10, 2010 at 2:36 PM, Hey Sky <heyskywalker@yahoo.com> wrote: > here is the message after the iteration stopped: > > numerical derivatives are approximate flat or discontinuous region encountered > could not calculate numerical derivatives > missing values encountered > (error occurred in ML computation) > (use trace option and check correctness of initial model) Most likely, your model is not identified. From your syntax, it appears that you are specifying the constant term twice: in the fixed effects equation and in the random effects equation(s). Try -nocons- option if you need the constant in the random effects, although make sure it does make sense for your model. Your equations (-eq- commands) must have names; Go(ul)d only knows how Stata interprets the empty -eq-s in -gllamm- context. > I am still not familiar with the gllamm options so that I think there must has something wrong > in my code. I also have tried to do as what the example on gllamm manual chpater 5.2.1 p59 > did, it does not work either and give the same message as above. > > the model should be ok since fortran code gives satisfied result. and I cannot use stata since > the data center does not have it and not allowed to install it either. > > here is what I tried and edu is a 0/1 dummy: > > gen cons=1 > eq: cons > eq: edu > > gllamm dep indep, i(id) base(5) link(mlogit) family(binom) nip(2) ip(f) nrf(2) /// > eq(cons mu2) dots trace -- Stas Kolenikov, also found at http://stas.kolenikov.name Small print: I use this email account for mailing lists only. * * 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/

**References**:**st: question on gllamm for discrete latent variable with one factor structure***From:*Hey Sky <heyskywalker@yahoo.com>

**Re: st: question on gllamm for discrete latent variable with one factor structure***From:*Stas Kolenikov <skolenik@gmail.com>

**Re: st: question on gllamm for discrete latent variable with one factor structure***From:*Hey Sky <heyskywalker@yahoo.com>

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