1. TIME-VARYING EFFECT MODEL FOR STUDYING GROUP DIFFERENCE IN HEALTH BEHAVIOR Open Access Author: Yang, Songshan Title: TIME-VARYING EFFECT MODEL FOR STUDYING GROUP DIFFERENCE IN HEALTH BEHAVIOR Graduate Program: Statistics Keywords: Time varying-coefficient effect model File: Download Penn_State_University_Thesis.pdf Committee Members: Runze Li, Thesis Advisor/Co-AdvisorBing Li, Committee MemberMatthew Logan Reimherr, Committee Member