[R] smooth.spline _df_ parameter?

[Wolski]

Hi,

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?


/E



Dipl. bio-chem. Eryk Witold Wolski             @    MPI-Moleculare Genetic   
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