Re: [R] Non-Linear Regression Help

I have a fair bit of experience with both nls and rating curves. This is not a nls() problem, this is a model problem. The power law rating curve favored by hydrologists would not apply to your data as it's based on the idea that a log-log plot of discharge vs. stage, or state+a in your case is

Re: [R] Non-Linear Regression Help

If you insist on using nls() for anything that you don't understand extremely well, you will end up with frustration. nls() uses the same method K F Gauss used (with good understanding of the details) over 200 years ago. The Gauss-Newton approach inside works very well and efficiently for problems

Re: [R] Non-Linear Regression Help

nal Message- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Zachary > Shadomy > Sent: Friday, May 5, 2017 12:58 AM > To: r-help@r-project.org > Subject: [R] Non-Linear Regression Help > > I am having some errors come up in my first section of code. I have no

[R] Non-Linear Regression Help

I am having some errors come up in my first section of code. I have no issue in plotting the points. Is there an easier method for creating a non-linear regression using C*(x+a)^n. The .txt file is named stage_discharge with the two variables being stage and discharge. The data is a relatively smal