[R-sig-ME] False convergence when testing random effects

[David Duffy]

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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