1. New Models For Conditional Covariance Matrix Open Access Author: Zhang, Ying Title: New Models For Conditional Covariance Matrix Graduate Program: Statistics Keywords: covariance estimationsmoothing splineCholesky decompositionlocal linear regressionsemi-parametric regression File: Download Thesis_Ying.pdf Committee Members: Runze Li, Dissertation Advisor/Co-AdvisorRunze Li, Committee Chair/Co-ChairBing Li, Committee MemberZhibiao Zhao, Committee MemberQiang Du, Committee Member