[S] comparing spline fits with different df?

Bill Shipley (bshipley@courrier.usherb.ca)
Wed, 8 Apr 1998 13:43:21 -0400


Hello,
I know that there are a number of different methods that have been suggested
to choose the "best" span value, or smoother df, when using spline
smoothers. However, I would like to know if there is any way of testing
whether or not a spline fit with x df provides a significantly better fit
than a spline fit with y df? In other words, assuming normality and
homogeneity of variance for the residuals, what is the sampling distribution
of the smoother cross-validation score?
Bill Shipley
Departement de Biologie
Universite de Sherbrooke
Sherbrooke (Quebec)
CANADA J1K 2R1
bshipley@courrier.USherb.ca
voix: 819-821-8000 poste 2079
telecopieur: 819-821-8049
Visitez notre site WEB : http://www.usherb.ca/SCES/BIO/index.html

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