[R] Fitting exponential curve to data points
brown_emu at yahoo.com
Sat Jul 28 11:46:27 CEST 2007
Sorry, just got back into town.
I wonder if AIC, BIC, or cross-validation scoring couldn't also be used as
criteria for model selection - I've seen it mostly in the context of variable
selection rather than 'form' selection but in principle might apply here?
--- Dieter Menne <dieter.menne at menne-biomed.de> wrote:
> Andrew Clegg <andrew.clegg <at> gmail.com> writes:
> > ... If I want to demonstrate that a non-linear curve fits
> > better than an exponential, what's the best measure for that? Given
> > that neither of nls() or optim() provide R-squared.
> To supplement Karl's comment, try Douglas Bates' (author of nls) comments
> on the
> Short summary:
> * ... "the lack of automatic ANOVA, R^2 and adj. R^2 from nls is a
> not a bug :-)"
> * My best advice regarding R^2 statistics with nonlinear models is, as
> Reagan suggested, "Just say no."
> R-help at stat.math.ethz.ch mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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