Peter Ehlers wrote > > >> > > If the above data is all you have, I wouldn't chugg too long. > Looking at plots of Cfl~Pw and Cfl~Tsoil says to me that you > have far too much variability to fit your model. > > You might find this plot instructive: > > library(rgl) > plot3d(Pw, Tsoil, Cfl, col=1+(Pw<5), size=5) > > > Peter Ehlers > > I hadn't realized there was such a package, and wow, do I ever wish I'd learned of that plot3d sooner! I did have a substantially larger data set to work with, but after a much more careful look I realized it would never fit the extra param to the low Pw numbers-- the predictability just isn't there. The 3d plot confirms this, of course. I did, however, get the help I was looking for, so thank you all!
Danielle -- View this message in context: http://r.789695.n4.nabble.com/nls-and-if-statements-tp4630391p4630451.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.
