search for: leastsq

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 "R" for the coefficients. However, what was somewhat surprising was the the condition number of the covariance matrix reported by the SciPy leastsq program = 379. Is it possible to have what appear to be tight confidence i...

...ouptut confidence intervals, so what precisely did you do? > I would recommend using confint(). > > BTW, as in most things in R, nls() is 'a' non-linear least squares > routine: there are others in other packages. > >> 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 "R" for the >> coefficients. However, what was somewhat surprising was the the >> condition number of the covariance matrix reported by the SciPy leastsq >> program = 379. >> >> Is it poss...