Citation

Quaye K. Transp. Traffic Theory 1996; 13: 277-288.

Copyright

(Copyright © 1996, Publisher varies)

DOI

unavailable

PMID

unavailable

Abstract

A common approach for assessing the effect of a road safety countermeasure on a group of entities is to compare the accident experience on this treated group to the accident experience on a similar group of untreated entities (ie a comparison group). The principal assumption behind this approach is the similarity between the treated group and the comparison group. A major shortcoming of this approach is the lack of an objective method for assessing this similarity. In this paper it is proposed that since the available data for assessing the similarity of two groups of entities is probabilistic in nature, the decision process for selecting a comparison group is fundamentally stochastic. A stochastic approach for selecting the most appropriate comparison group is developed and its application illustrated with a numerical example. (A) For the covering abstract see IRRD 886400.