Re: st: xtmelogit question

[Jennifer Manuel <jm703@columbia.edu>]

Thank you, Maarten. No, it still doesn't converge when I leave out the 
cov(un) option. It converges when fitting the random-intercept model but 
not when introducing a random slope.

Jennifer

Maarten buis wrote:

> Does it converge if you leave out the -cov(un)- option?
> --Maarten
>
> --- Jennifer Manuel <jm703@columbia.edu> wrote:
>   
> > I am estimating a mixed-effects logistic regression model using 
> > xtmelogit. I'm examining the impact of two case management models on 
> > medication adherence among 198 individuals who were followed over a 
> > 3-year period. In estimating the model, I am getting the message 
> > "initial values not feasible" r(1400). The output is below. I've 
> > searched the listserv and have tried to use starting values from a 
> > simpler model using the from() option, but I still get the same error
> > message. I would be grateful for any advice on what I'm doing wrong.
> >
> > . xtmelogit nonadherencemo interval trtcond txBYintvl || id:
> > interval, 
> > cov(un) var
> >
> > Refining starting values:
> >
> > initial values not feasible
> > r(1400);
> >
> > Thank you,
> > Jennifer
> >
> > *
> > *   For searches and help try:
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> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> >
> >     
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
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>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
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>   
*
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