Model Averaging Estimation for Partially Linear Functional Score Models

Abstract

This paper is concerned with model averaging estimation for partially linear functional score models. These models predict a scalar response using both parametric effect of scalar predictors and non-parametric effect of a functional predictor. Within this context, we develop a Mallows-type criterion for choosing weights. The resulting model averaging estimator is proved to be asymptotically optimal under certain regularity conditions in terms of achieving the smallest possible squared error loss. Simulation studies demonstrate its superiority or comparability to information criterion score-based model selection and averaging estimators. The proposed procedure is also applied to two real data sets for illustration. That the components of nonparametric part are unobservable leads to a more complicated situation than ordinary partially linear models (PLM) and a different theoretical derivation from those of PLM.

Generalized Functional Feature Regression Models

“…To overcome these problems, functional regression based on functional principle component (FPC) analysis (FR-FPCA), has been developed recently (Zhu et al, 2014;Wong et al, 2019;Liu et al, 2021;Xue and Yao, 2021;Zhou et al, 2023). Specifically, Zhou et al (2023) studied functional linear regression that involves irregularly, sparsely and noisily sampled functional covariates, and systematically investigated the theoretical properties of the estimators within this framework.…”