Quadratic Inference Functions for Varying‐Coefficient Models with Longitudinal Data
Quadratic Inference Functions for Varying‐Coefficient Models with Longitudinal Data
Summary Nonparametric smoothing methods are used to model longitudinal data, but the challenge remains to incorporate correlation into nonparametric estimation procedures. In this article, we propose an efficient estimation procedure for varying‐coefficient models for longitudinal data. The proposed procedure can easily take into account correlation within subjects and deal directly …