Message-ID: <Pine.LNX.4.64.1108121854330.31786@orpheus.qimr.edu.au>
Date: 2011-08-12T09:01:35Z
From: David Duffy
Subject: False convergence when testing random effects
In-Reply-To: <1831B520E6E23C41ACD7FDCB342E84E210E5C507@staff-mail1.qmu.ac.uk>
On Thu, 11 Aug 2011, Finlayson, Ian wrote:
> Hello,
>
> I've been building models with lmer() and keep running into False
> Convergence warnings. I keep encountering cases where the addition of
> one parameter seems to lead to the warning, but then the subsequent
> addition of another remedies it.
[...]
> What's particularly alarming is that I ran the same analyses about 8 or
> 9 months ago without any problems.
Some of the developers will hopefully pipe up, but I believe there has
been a certain amount of fiddling around with the code, changing the
maximizer etc. Are your example data shareable? It is probably a good
idea to run these types of model in a couple of different packages anyway.
Just 2c, David Duffy.
--
| David Duffy (MBBS PhD) ,-_|\
| email: davidD at qimr.edu.au ph: INT+61+7+3362-0217 fax: -0101 / *
| Epidemiology Unit, Queensland Institute of Medical Research \_,-._/
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