Re: [R] nls.profile

From: Douglas Bates <bates_at_stat.wisc.edu>
Date: Thu, 31 Mar 2011 12:45:38 -0500

On Thu, Mar 31, 2011 at 4:02 AM, Daniel Kaschek <daniel.kaschek_at_physik.uni-freiburg.de> wrote:
> Hello,

> I use nls.profile to compute confidence intervals of parameter estimates
> of a non-linear model. When computing the profiles, the model function
> produces an error for certain parameter combinations. Therefore nls
> fails and so does nls.profile.

> Is there a way to tell nls.profile to ignore errors and to proceed with
> the next parameter value?

Not easily. What I tend to do is to adjust (increase) the alphamax parameter (which is a misnomer, it should have been alphamin but I got confused) until the profile can succeed.



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