[R] comparing fit of cubic spline

[Simon Wood]

On Monday 21 May 2007 16:17, Thomas Reed wrote:
> I want to compare the fit of a quadratic model to continuous data, with
> that of a cubic spline fit. Is there a way of computing AIC from for e.g. a
> GAM with a smoothing spine, and comparing this to AIC from a quadratic
> model?
library(mgcv)
AIC(gam(y~s(x))) ## a `generalized aic' since effective df used 
AIC(gam(y~x+I(x^2)))


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> Tom Reed
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> Simon Wood, Mathematical Sciences, University of Bath, Bath, BA2 7AY UK
> +44 1225 386603  www.maths.bath.ac.uk/~sw283