Efficient and Adaptive Estimation for Semiparametric Models

Johns Hopkins University Press 1993; Springer reprint 1998. Classical source for the efficient score as the L2 residual after projection onto the nuisance tangent space and for least-favourable-direction orthogonality. It supplies the statistical interpretation of the full-data residual score used around DS17, but not the binned tilt-residual identity, endogenous tilt fixed point, or any hard-partition obstruction.