[R] Cook-Weisberg confidence curves

Douglas Bates bates at stat.wisc.edu
Mon May 28 05:15:05 CEST 2001

Kari Ruohonen <kari.ruohonen at saunalahti.fi> writes:

> On Fri, 25 May 2001, Prof Brian Ripley wrote:
> > I wouldn't know: what are these confidence curves you are attributing to
> > Cook-Weisberg?  
> I am referring to Cook D & Weisberg S (1990) Confidence curves in
> nonlinear regression. J. Am. Stat. Ass. 85, 544-551. 
> Confint() seems to do what I want, thank you for your help.

I think if you read that paper you will see mention in there of the
techniques described in chapter 6 of Bates and Watts (Wiley, 1988).
Although the mention is to say that that the Cook and Weisberg
technique is quite different, it is, in fact, exactly the same as
that described in Bates and Watts.

The function plot.profile.nls in the nls library produces plots of the
profile t function or its absolute value.  Try

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