Model failed to converge in bootMer

Please forward this question to r-sig-mixed-models at r-project.org.  Are
you using the latest CRAN version (1.1-8) of lme4?

  Ben Bolker


On Tue, Jul 21, 2015 at 3:33 AM, Francisco Fabuel <pfabuel at gmail.com>
wrote:

Mr. Bolker:

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