Modeling

Computer Model Evaluation

This research consisted of two complementary projects. Evaluation of the fidelity of computer models to reality is central to assessing their effectiveness in understanding real phenomena and predicting results of innovative policies. Though inherently statistical, model evaluation lacks a unifying statistical framework. NISS was hired to help find an… more

Intelligent Transportation Systems Integration of Real-Time Emissions Data and Traffic Management Systems

There is a shortage of effective and feasible procedures for validating microscopic, stochastic traffic simulation models. Many times when the micro-simulators are used on real networks, it has led to traffic gridlock, or to simulation failures. The failures could provide clues about where there… more

Mathematically/Statistically Based Validation System

Automotive manufacturer General Motors needed an unbiased third party to help them evaluate their computer models and to implement a strategy on test bed problems. Using a good model can help save the company time and money by designing an energy efficient car that performs well in safety… more

Traffic Signalization

How could the city of Chicago find a way to reduce waiting times at traffic signals and help reduce traffic congestion?… more

Transportation Study - Establishing Monitoring Programs for Travel Time Reliability

Prepare a handbook for traffic system managers describing validated best practices for estimating travel time reliability from multiple data sources under multiple use case scenarios. The principal statistical issues, on which the NISS engagement in the project focuses, are: 1) Estimation of entire travel distributions… more