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st: capture xtmixed


From   "Adrian Sayers" <adrian.sayers@bristol.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: capture xtmixed
Date   Fri, 25 Jan 2013 17:00:05 -0000

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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