I'm not sure about the details of the error message but if R is suggesting
to rescale the variables then you can do this using the scale() function as
one option. Doing this usually helps the model converge.

?scale

Neil.


On Fri, Mar 28, 2014 at 1:31 PM, Cintia Akemi Oi <
CintiaAkemi.Oi@bio.kuleuven.be> wrote:

> Hello,
>
> I'm having this warning messages:
>
> Warning messages:
> 1: In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv,  :
>   Model failed to converge with max|grad| = 0.0523852 (tol = 0.001)
> 2: In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv,  :
>   Model is nearly unidentifiable: very large eigenvalue
>  - Rescale variables?
>
> Thanks in advance.
>
>
>
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