Re: [R] Interactions in a nls model

Lawrence Nguy-Robertson wrote: Thank you R-forum for you generous help. Gabor Grothendieck, I am not sure if anova in the form that you suggested is the most appropriate (This is probably more of a statistics related, rather than R related at this point). The way I understand anova is that

Re: [R] Interactions in a nls model

faculty.net/dogle/fishR/gnrlex/VonBertalanffyCompare/VonBertalanffyCompare.pdf Good luck. -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- project.org] On Behalf Of Gabor Grothendieck Sent: Tuesday, February 08, 2011 10:43 PM To: Anthony Lawrence Nguy-Robertson Cc: r-

Re: [R] Interactions in a nls model

Your local statistician can help here, too, if needed. But be warned, inference is inherently difficult in such situations. -- Bert On Tue, Feb 8, 2011 at 1:12 PM, Anthony Lawrence Nguy-Robertson wrote: I am interested in testing two similar nls models to determine if the lines are sta

[R] Interactions in a nls model

I am interested in testing two similar nls models to determine if the lines are statistically different when fitted with two different data sets; one corn, another soybean. I know I can do this in linear models by testing for interactions. See Introductory Statistics with R by Dallgaard p212-21