Thanks for the comments everyone. I was hoping to not have to find someone in the stats department ... well, we'll see.
So in response to Z's comment ... I have tried breakpoints(Na ~ yield) and I did expect to get something continuous. The idea was to get two or three linear functions making up the curve. And then from there, get a CI from these lines. Of course, it wouldn't be good. (This is coming from a non-stats guy ... I'm a civil engineer by degree and am now learning to be a modeler as a grad student!). Do you know of any more examples of breakpoints? The examples in the references are great, but I can't seem to get it right. Thanks again. -- View this message in context: http://r.789695.n4.nabble.com/breakpoints-and-nonlinear-regression-tp4303629p4305000.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
