[R] r-square for non-linear regression

Martin Henry H. Stevens HStevens at muohio.edu
Tue Jul 16 15:29:32 CEST 2002

Not proof, but example of precedent for r-sq.:
Juliano, S. A., and F. M. Williams. 1987. A comparison of methods for 
estimating the functional response parameters of the random predator 
equation. Journal of Animal Ecology 56:641-653.

At 04:45 AM 7/16/2002, Dieter Menne wrote:
>We have extracted parameters from physiological measurements by fitting
>SSlogis-like curves with nlsList and nlme.
>We presented residuals plot in a paper, but a referee argues that these
>cannot be included (too technical), and r-square values should be given
>instead to compare the goodness of fit with those of other authors.
>I remember that 30 years ago in my stat 101, I learned that r-square is
>nonsense for non-linear fits, but I cannot find a referee-proof citation for
>this. Probably SAS does it (I know what Bill Venables will say about this
>Can anybody provide me a citation on r-square for/against non-linear fits,
>or tell me that I am wrong?
>Dr. Dieter Menne
>Biomed Software
>72074 Tübingen
>Tel (49) (7071) 52176
>FAX (49) (7071) 55 10 46
>dieter.menne at menne-biomed.de
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