[R-sig-ME] Increasing iteration limit / lmer bug

Adam D. I. Kramer adik at ilovebacon.org
Thu Apr 1 02:14:59 CEST 2010

With apologies, after a lot of grepping around and reading pages on the
internet, yes, as you expected, my model is to blame.

That said, I think that it is quite appropriate for commands listed in the
?help page to actually work or do what they say--in the below case, it is
clear that maxIter is being ignored.

If it is the case that a "valid" or "good" or "non-stupid" model will easily
be fit with maxIter=300 and maxFN=900, then there is no reason to allow
users to think they have changed this value when they have not.


On Wed, 31 Mar 2010, Adam D. I. Kramer wrote:

> Dear colleagues,
> 	I am attempting to fit a model in this manner:
> l3 <- glmer(mug ~ condition*time +
> (time|cafe),family=binomial,data=data)
> ...the model fails to fit, however, noting:
> In mer_finalize(ans) : iteration limit reached without convergence (9)
> ...so, of course, I read the man page for glmer and added
> control=list(maxIter=3000). However, the program ran for the same amount of
> time (about 10 minutes) and produced the same error (and, incidentally, the
> same output).
> So, I believe there to be a bug in glmer such that maxIter is not
> functioning.
> I then upped maxFN, too, (also to 3000) in case that was the problem, but
> found no meaningful difference in the model produced or the time taken to
> fit the model.
> Could somebody recommend a workaround? I would like to fit this model.
> (running R 2.10.1, lme4 v. 0.999375-32)
> Also, in case it matters, 'time' here is a categorical variable
> reperesenting several within-subjects timepoints--there are some other
> (unanswered) posts to this list in which people appear to have fairly
> complex within-subjects effects. Perhaps the issue is that the defaults
> which are in place are insufficiently high for moderately complex
> within-subjects models?
> Cordially,
> Adam D. I. Kramer
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