@article{ref1,
title="Estimation of the effects of countermeasures on different types of accidents in the presence of regression effects",
journal="Accident analysis and prevention",
year="1988",
author="Danielsson, S.",
volume="20",
number="4",
pages="289-298",
abstract="In an earlier paper [Danielsson, 1986], we studied the problem of estimating the safety effect of a countermeasure on the expected number of accidents at road junctions when high-accident sites are selected for the study. Often, however, the countermeasure leads to varying effectiveness on different types of accidents. This paper is a generalization in that we estimate effects of countermeasures for each type of accident. A major result, for which empirical support is provided, is that the expected regression effect is the same for all types of accidents.",
language="en",
issn="0001-4575",
doi="",
url="http://dx.doi.org/"
}