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Re: st: capture xtmixed


From   Jeph Herrin <stata@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: capture xtmixed
Date   Fri, 25 Jan 2013 13:50:52 -0500

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
School of Social and Community Medicine
Canynge Hall
39 Whatley Road
Bristol
BS8 2PS
United Kingdom

Tel +44 (0)117 9287258
**********************************************************



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