tpssmoother: Evaluate the smoothing matrix, the radial basis matrix, the
polynomial matrix and their associated coefficients
Description
The function evaluates the smoothing matrix H, the
matrices Q and S and their associated
coefficients c and s. This function is not intended to be used directly.Usage
tpssmoother(X,Y=NULL,lambda,m=2)
Value
Returns a list containing the smoothing matrix H, and two
matrices denoted Sgu (for null space) and Qgu.Details
see the reference for detailed explanation of Q (the
semi kernel or radial basis) and
S (the polynomial null space). Both matrices are computed using
fields.References
C. Gu (2002) Smoothing spline anova models. New York: Springer-Verlag.