Leave one-subject cross-validation score for spline fit
CVspline(Xvec, Yvec, ID, nKnots, Degree, Wt)numeric vectors of data values, Xvec and Yvec must have the same length.
subject ID of the data value
number of equally-spaced knots
degree of polynomial splines
a weight vector. For longitudinal data, Wt=1/N corresponds to measurement uniform weight and Wt=1/(nni) corresponds subject uniform weight.
Wu, C.O. and Tian, X. Nonparametric Models for Longitudinal Data. Chapman & Hall/CRC. To appear.