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Re: st: Capture failing on xtmixed


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Capture failing on xtmixed
Date   Mon, 28 Jan 2013 14:10:40 +0000

I don't think there is any information here that would enable anyone
to add to what you report.

The aim of -capture-  is just to eat an error and to allow
continuation by the next command.

-capture- can not fix errors or make a command try again, try harder
or do something differently.

Are you saying that you tried to display the error code as e.g.

. display _rc

If so, what happened?

On Mon, Jan 28, 2013 at 1:54 PM, Adrian Sayers
<adrian.sayers@bristol.ac.uk> wrote:

> 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
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