Thomas Hoffmann wrote: > Dear R-helpers > > I would like to do a fit of the form: y = a (x+c)**b, where a, b and c > are unknown. > > Does anybody know how to do it?
If they did but didn't answer, would it matter? > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ... including some data... Perhaps take the log of both sides and use nls with intercept log(a)? Or include an additive intercept and apply nls to the equation without taking the log? Depends on your model of errors... -- --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<[EMAIL PROTECTED]> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
