[R] r-square for non-linear regression

Dieter Menne dieter.menne at menne-biomed.de
Tue Jul 16 10:45:14 CEST 2002

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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