Nonparametric Regression and Short‐Term Freeway Traffic Forecasting
Publication: Journal of Transportation Engineering
Volume 117, Issue 2
Abstract
After reviewing the problem of short‐term traffic forecasting a non‐parametric regression method, the k‐nearest neighbor (k‐NN) approach is suggested as a candidate forecaster that might sidestep some of the problems inherent in parametric forecasting approaches. An empirical study using actual freeway data is devised to test the k‐NN approach, and compare it to simple univariate linear time‐series forecasts. The k‐NN method performed comparably to, but not better than, the linear time‐series approach. However, further research is needed to delineate those situations where the k‐NN approach may, or may not be, preferable. Particular attention should be focused on whether or not regression methods, which forecast mean values, are appropriate for forecasting the extreme values characteristic of transitions from the uncongested traffic regime to the congested regime. In addition, larger data bases may improve the accuracy of the k‐NN method.
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Copyright © 1991 ASCE.
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Published online: Mar 1, 1991
Published in print: Mar 1991
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