Hi,
Apologies for posting this again.
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 properly
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
and then stata exits (Aborts) the program.
I am not sure why it is just not being skipped, and the error code stored in
_rc as it should be.
I have a feeling it is to do with some of the mata code.
Any ideas or suggestions for a work around or a proper fix would be greatly
appreciated.
I am running stata 12.1
Thanks
Adrian
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
