On Wed, Apr 15, 2009 at 1:27 PM, Manuel Gutierrez <manuelgutierrezlo...@gmail.com> wrote: > I want to fit the model y=a*x^b using nls; where "a" should be different for > each level of a factor. > What is the easiest way to fit it? Can i do it with nls? > I've looked the help pages and the MASS example in page 249 but the formula > is different and I don't know how to specify it for my model.
What about linearizing the model with log() and use lm() afterwards? Paul ______________________________________________ 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.
