[R-sig-ME] lmer warning on certain OS

[Ben Bolker]

  Does updating to the very latest lme4 version (1.1-23) help with
this?  (Some convergence tolerances have been tightened in this
version.)

  cheers
   Ben Bolker

On Sat, Apr 11, 2020 at 6:59 PM Laura Chihara via R-sig-mixed-models
<r-sig-mixed-models using r-project.org> wrote:
>
> I'm teaching an undergraduate statistics class and was preparing to do
> some simple examples which ran fine the last time I taught. But this
> time, I am getting warning messages (though the summary output looks OK).
>
> These warnings occur on a Dell desktop running Windows 10 as well as a
> Windows Surface 7. I also ran this on RStudio running on a college
> server which is a Unix server (Ubuntu 16.04.6 LTS) and saw the warning.
> However, the warning message does not occur on an Apple machine nor on
> RStudio-Cloud (https://rstudio.cloud).
>
> (I am running the most recent version of R, RStudio and lme4).
>
> #-----------------------------
> # R Script attached has the following
>
> library(lme4)
> library(nlme)
> lmer(height ~ age + (age | Subject), Oxboys) #warning
>
> mean(Oxboys$age)
> Oxboys$age2 <- Oxboys$age - mean(Oxboys$age)
> lmer(height ~ age2 + (age2|Subject), Oxboys)  #no warning
>
>
> lmer(distance ~ age + (age |Subject), Orthodont) #warning
>
> #But a more complicated mode:
> lmer(distance ~ age*Sex + (age|Subject), Orthodont)
> #--------------------------------------------------------------------------------------
>
> #Warning:
>
> Warning message: In checkConv(attr(opt, "derivs"), opt$par, ctrl =
> control$checkConv, : Model failed to converge with max|grad| = 0.110724
> (tol = 0.002, component 1)
>
> #session info
>
> > sessionInfo() R version 3.6.3 (2020-02-29) Platform:
> x86_64-w64-mingw32/x64 (64-bit) Running under: Windows 10 x64 (build
> 18362) Matrix products: default Random number generation: RNG:
> Mersenne-Twister Normal: Inversion Sample: Rounding locale: [1]
> LC_COLLATE=English_United States.1252 LC_CTYPE=English_United
> States.1252 [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C [5]
> LC_TIME=English_United States.1252 attached base packages: [1] stats
> graphics grDevices utils datasets methods base other attached packages:
> [1] nlme_3.1-144 lme4_1.1-21 Matrix_1.2-18 loaded via a namespace (and
> not attached): [1] minqa_1.2.4 MASS_7.3-51.5 compiler_3.6.3 tools_3.6.3
> Rcpp_1.0.4 [6] splines_3.6.3 grid_3.6.3 nloptr_1.2.2.1 boot_1.3-24
> lattice_0.20-38
>
> --
>
> ####################################################
> Laura Chihara
> Prof. of Mathematics and Statistics
> Dept. of Mathematics and Statistics
> One North College St.
> Carleton College
> Northfield Mn 55057
>
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