A genetic algorithm-based method for improving quality of travel time prediction intervals
economics - value of time, mode - bus, mode - car, place - australasia
Travel time, Prediction interval, Neural network, Genetic algorithm
The transportation literature is rich in the application of neural networks for travel time prediction. The uncertainty prevailing in operation of transportation systems, however, highly degrades prediction performance of neural networks. Prediction intervals for neural network outcomes can properly represent the uncertainty associated with the predictions. This paper studies an application of the delta technique for the construction of prediction intervals for bus and freeway travel times. The quality of these intervals strongly depends on the neural network structure and a training hyperparameter. A genetic algorithm–based method is developed that automates the neural network model selection and adjustment of the hyperparameter. Model selection and parameter adjustment is carried out through minimization of a prediction interval-based cost function, which depends on the width and coverage probability of constructed prediction intervals. Experiments conducted using the bus and freeway travel time datasets demonstrate the suitability of the proposed method for improving the quality of constructed prediction intervals in terms of their length and coverage probability.
Permission to publish the abstract has been given by Elsevier, copyright remains with them.
Khosravi, A., Mazloumi, E., Nahavandi, S., Creighton, D., & Van Lint, J.W.C. (2011). A genetic algorithm-based method for improving quality of travel time prediction intervals. Transportation Research Part C: Emerging Technologies, Article in Press, Corrected Proof.