[R-sig-ME] Warning message

[katrin.luder at iee.unibe.ch]

Hello

I'm currently working on my master thesis and i'm using the lme4 package to do glmer models. To find the best model, i'm using the forward selection approach. After putting the former explanatory variables in, everything works fine, but after a while this error message is showing up:

Warning message:
In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv,  :
  Model failed to converge with max|grad| = 0.00377805 (tol = 0.001, component 2)

I have found different reasons in Google but nothing really fitted my problem. At some forum, it was written that i can also just skip this error message and go on with what i was doing. But the more explanatory variable i put in, the more often this error message occurs.

I would be very happy if you could help me out with this problem. I already asked several ecologist and statisticians but no one was able to help me.

Your sincerely,
Katrin Luder

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