You need to combine all the data into one set and add another variable, call it "dataset," with values 1 and 2. Then you can fit a model to this **one combined" dataset that has an additive term for "dataset," and, if you care to, test it for significance. However, as usual, that probably will not be of much scientific value. I contend that tests of significance mean little unless used in preplanned and appropriately powered studies. Most statisticians would probably characterize this contention as nuts, however, so feel free to ignore it.
If you don't understand what I said, seek local counsel. -- Bert On Fri, Feb 24, 2012 at 11:28 PM, 孟欣 <lm_meng...@163.com> wrote: > Hi all: > > I have two curve models: > > model1<-nls(result ~ exp(b0 + b1*(time)), start = list(b0 = 0, b1 = > 5),trace=TRUE,data=data1) > model2<-nls(result ~ exp(b0 + b1*(time)), start = list(b0 = 0, b1 = > 5),trace=TRUE,data=data2) > > I wanna compare the two models to find out whether the difference between > them is significant or not. > > How can I do then? > > Many thanks! > > > My best > [[alternative HTML version deleted]] > > ______________________________________________ > 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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.
