Use of chi-squared distribution for comparing accident frequencies.

Author(s)
Garwood, F. & R.F. Newby.
Year
Abstract

The comparison of accident frequencies before and after some change in the road system is a means of finding whether the change is having a beneficial effect on road safety. To decide whether the change is statistically significant the chi- squared test is usually employed. The use of the chi-squared distribution in giving a sample formula for fixing the length of a before and after experiment is described.

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Publication

Library number
A 8043 (In: A 5689 S) IRRD 59777
Source

In: Symposium on the Use of Statistical Methods in the Analysis of Road Accidents, held at the Road Research Laboratory (RRL), April 14-16, 1969, published by OECD, Paris, 1970, p. 37-43

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