[R-sig-ME] Fwd: Model failed to converge in bootMer

[Ben Bolker]

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On 15-07-21 07:48 AM, Francisco Fabuel wrote:
> I'm trying to estimate some quantities derived from a lmer object
> using bootstrap. When I use the function bootMer, a large
> proportion of replications seems to fail to converge, but if I
> program the bootstrap using package boot, everything seems go
> well.
> 
> Please, find attached a simple example (R script and data) of the
> problem: with bootMer in 10 simulations, I've got 7 warnings:
> 
> Warning messages:1: In checkConv(attr(opt, "derivs"), opt$par, ctrl
> = control$checkConv,  : Model failed to converge with max|grad| =
> 0.00132463 (tol = 0.001, component 1)
> 
> 
> Thank you in advance. Francisco Fabuel

  Scripts and data generally get stripped from messages sent to the
mailing list; you may need to post them somewhere else and send along
a URL.

  This is a little surprising since bootMer internally calls boot, so
the devil must be in the details somewhere -- which goes back to the
fact that we do probably need to see the code (and preferably data)...

  Ben Bolker

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