[R] Re: none

[Douglas Bates]

VALIERE Nathaniel <valiere at biomserv.univ-lyon1.fr> writes:

> How can get some information about error "step factor reduced below
> minimum" appeared after nls function.

The best way to see what is causing this is to use trace=TRUE in the
call to nls, which will then print the parameter values at each
iteration.  The error message indicates that the iterations are
reaching a point where the increment is ill-defined.  You will need to
determine better starting estimates for the parameters or perhaps
reduce the complexity of the model.

I am happy to correspond privately with you on what might be happening
in this case if you want to send me specifics on the model and the
data.


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