[ADMB Users] a difference in estimates between versions?

[Ian Taylor]

Hi Saang-Yoon,
It sounds from your email like you're changing versions AND changing 
from 32bit to 64bit. I've found that 32 and 64 provide very slightly 
different results, which I presume is due to small differences in the 
precision of the derivative calculations and thus a different path 
through the likelihood surface and a slightly different point when the 
convergence criterion gets met.

You might try comparing 32 to 32 between versions or 32 to 64 within one 
version to check whether this is a factor in the change you've observed.
-Ian

On 10/04/2011 03:51 PM, Saang-Yoon wrote:
> Hello, all.
>
> I would like to report differences in estimates between the latest
> version (admb-ide-452-1 (64bit)) and the previous version (admb-
> ide-450-1).   Today I found differences in estimates between versions
> from my class where I used the latest version and the other folks all
> used the previous version.  Applying the same TPL and DAT files, my
> results (e.g., STD file) are slightly but obviously different from the
> others whose values are the same among them.   In the two versions,
> estimation were all successful including Hessian matrix elements.
>
> I wonder about why.  More importantly I wonder which version is
> reliable.
>
> If you are skeptical of our finding, then please apply a DAT file and
> a TPL file that has a "non" linear model to the different versions, or
> request me to send you the DAT and TPL files.
>
> Thank you,
>
> Saang-Yoon
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