[R] smooth.spline _df_ parameter?

Wolski wolski at molgen.mpg.de
Fri Nov 5 15:36:36 CET 2004


I am usign the smooth.spline function. 

I am not sure how the _df_ (degrees of freedom) parameter, 
if set, influences _lambda_ in eq:

L = (y - f)' W (y - f) + lambda c' Sigma c

Is _df_  substituting tr(Sigma), if defined, in the equation: r = tr(X' W X) / tr(Sigma),
which is used to compute: lambda = r * 256^(3*spar - 1)?

How _spar_ is set if not defined?


Dipl. bio-chem. Eryk Witold Wolski             @    MPI-Moleculare Genetic   
Ihnestrasse 63-73 14195 Berlin                'v'                            
tel: 0049-30-83875219                        /   \                           
mail: witek96 at users.sourceforge.net        ---W-W----                        

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