Inner function to compute the per-subject scores via independent quantile regressions on the loading functions.
Arguments
- Y
The \((N \times T)\) matrix of observed time instants.
- Y.mask
Mask matrix of the same dimensions as Y indicating which observations in Y are known.
- loadings
Matrix of loading coefficients.
- quantile.value
The quantile considered.
- offset
Optional offset subtracted from Y before fitting: NULL (no offset), a length-T vector (e.g. a population intercept), or an \((N \times T)\) matrix (e.g. fitted values from a regression part).