[R] Confidence Limits for Non-Linear Regression

Dieter Menne dieter.menne at menne-biomed.de
Fri Jan 12 08:33:36 CET 2001

Dear friends of nls,

I have tried confint.nls on a few logistic regression fit; all curves are
well-behaved. Only in 1 out of 3 cases, the method converged, it stopped on the
other cases with "singular matrix" or "number of iterations exceeded". I have
put in the intermediate step by computing the profiles first and manipulating
alphamax and delta.t, but I could not find a compromise that worked.

Anybody can give me a hint?


(Sorry, could not find the right method to reply to a thread found in the
Dr. Dieter Menne
Biomed Software
72074 Tübingen
Tel (49) (7071) 52176
FAX (49) (7071) 55 10 46
dieter.menne at menne-biomed.de

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