Re: st: capture xtmixed

[Jeph Herrin <stata@spandrel.net>]

You don't say if the program is aborting, or simply reporting the error. 
If the latter, and you don't want to see it, omit -noisily-. Note that 
you can determine the convergence status in that case by checking if 
e(converged)==1.

If the program is aborting, that is indeed odd.

hth,
Jeph


On 1/25/2013 12:00 PM, Adrian Sayers wrote:
> Hi ,
>
> I have come across some odd behaviour.
>
> I am attempting to capture xtmixed in a simulation study. However it doesn't
> seem to be working.
>
> So i have :
> capture noisily xtmixed     obs_ht  age_1 age_2 || id: age_1 age_2 ,
> cov(unstruct)
>
> it has trouble converging. And eventually gives the following error:
> 	
> 	Hessian is not negative semidefinite
> 	conformability error
>
> But i am not sure why this is just not being skipped to the next run.
>
>
> Any ideas or suggestions
>
> I am running stata 12.1
>
> Thanks
>
> Adrian
> *********************************************************
> Adrian Sayers
> RM 3.09
> Medical Statistician
> University of Bristol
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