1. functional form and heterogeneity effects on safety performance function estimation Open Access Author: Hariharan, Baradhwaj Title: functional form and heterogeneity effects on safety performance function estimation Graduate Program: Civil Engineering Keywords: Crash frequencyheterogeneitycount datanegative binomialmultinomial fractional polynomialover-dispersion File: Download Barad-dissertation_final_draft_MAIN_FILE_to_upload_second_updates.pdf Committee Members: Venkataraman Shankar, Dissertation Advisor/Co-AdvisorSwagata Banerjee Basu, Committee MemberJeremy Joseph Blum, Committee MemberEvelyn Ann Thomchick, Committee Member