Re: [R] Significance of confidence intervals in the Non-Linear Least Squares Program.

Dear Pf. Ripley, I use the nls() function coupled with the confint() to obtain the confidence interval of assessed parameters of fitting model. I don't understand why the confidence intervals estimated with such a method aren't consistent? Regards B. Boulinguiez Ph.D. in Chemistry Ecole Nation

Re: [R] Significance of confidence intervals in the Non-Linear Least Squares Program.

On Wed, 26 Mar 2008, glenn andrews wrote: > I am using the non-linear least squares routine in "R" -- nls. I have a > dataset where the nls routine outputs tight confidence intervals on the > 2 parameters I am solving for. nls() does not ouptut confidence intervals, so what precisely did you do?

[R] Significance of confidence intervals in the Non-Linear Least Squares Program.

I am using the non-linear least squares routine in "R" -- nls. I have a dataset where the nls routine outputs tight confidence intervals on the 2 parameters I am solving for. As a check on my results, I used the Python SciPy leastsq module on the same data set and it yields the same answer as