Inner function to construct the tensor product design matrix required for functional data modeling. It efficiently scales the B-spline basis evaluations by the subject-specific functional principal component scores across all observed time points.
Arguments
- scores
A matrix of functional Principal Component Analysis (fPCA) scores for each subject.
- Y.mask
A logical mask matrix of dimensions (N x T) indicating which time points are observed (
TRUE) or missing (FALSE) for each subject.- spline.basis
The evaluation matrix of the B-spline basis functions at the time points.
- intercept
Boolean. If TRUE (default) the design starts with an intercept block built from
spline.basis[, -1]; if FALSE only the score-scaled spline blocks are produced.