> Or is
> it easier just to accept that some models work with some optimizers
> and not with others?
>

I've spent a lot of time comparing results from SAS, asreml, nlme and lme4
(old/new).   Sometimes you just get different results, no matter how hard
you try.  Your example is the 2nd or 3rd case that I've seen where
nelder_mead is giving substantially different results from bobyqa.  It
would be great if you could investigate your data and see if you can adjust
the settings  of nelder_mead to get better results.  This would be useful
information.

Kevin

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