[R-sig-ME] Passing lme4 optimizer arguments to pbmodcomp and afex/mixed

[Ben Bolker]

  At the moment it's not possible to increase the number of iterations;
that's on the list to allow, but my guess is that that's not going to
help. Unfortunately, our test cases for lme4 did not include a lot of
binomial GLMMs with complete separation and/or extreme values of the
beta parameters (say |beta|>5).  I suspect that what's going on here is
similar to the examples listing in these issues ..

https://github.com/lme4/lme4/issues/134
https://github.com/lme4/lme4/issues/124

  Is it in fact the case that if you fit this model with lme4.0 (or an
older version of lme4) you get large values of beta?

  Looks like we're going to have to put higher priority on fixing this ...

  Ben Bolker


On 13-09-25 09:13 AM, Tom Wenseleers wrote:
> Dear all, Just  a quick question re pbmodcomp (I'm using version
> 0.4-0 of pbkrtest, and latest devel version of lme4). I am calling
> pbmodcomp via afex, but I am getting the dreaded error "3 nodes
> produced errors; first error: pwrssUpdate did not converge in 30
> iterations" (my call is
> mixed(ALATES~ANT_TENDED*MELEZITOSE+NR_START+(1|CLONES)+(1|PLANT)+(1|REPLICATE),type=3,family=poisson,method="PB",args.test
> = list(nsim = 10,cl=cl),data=data_alates) ).
> 
> I would now like to try passing some optimizer arguments to the lmer
> calls. To do this I first called options(glmerControl=list(optimizer
> = c("bobyqa", "bobyqa"),tolPwrss = 1e-03
> ,optCtrl=list(maxfun=1000))) But then I still get " pwrssUpdate did
> not converge in 30 iterations". Does one of you happen to know how I
> could perhaps change the nr of maximum iterations to >30? And also if
> it is possible to pass such arguments in the call to mixed and/or
> pbmodcomp?
> 
> Cheers, Tom
> 
> 
> _______________________________________________________________________________________
>
>  Prof. Tom Wenseleers P      Lab. of Socioecology and Social
> Evolution Dept. of Biology Zoological Institute K.U.Leuven 
> Naamsestraat 59, box 2466 B-3000 Leuven Belgium +32 (0)16 32 39 64 /
> +32 (0)472 40 45 96 //tom.wenseleers at bio.kuleuven.be 
> http://bio.kuleuven.be/ento/wenseleers/twenseleers.htm
> 
> 
>