Power computations in time series analyses for traffic safety interventions

McLeod, A. Ian & Vingilis, Evelyn R. (2008) Power computations in time series analyses for traffic safety interventions. Accident Analysis and Prevention, 40(3), pp. 1244-1248.

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The evaluation of traffic safety interventions or other policies that can affect road safety often requires the collection of administrative time series data, such as monthly motor vehicle collision data that may be difficult and/or expensive to collect. Furthermore, since policy decisions may be based on the results found from the intervention analysis of the policy, it is important to ensure that the statistical tests have enough power, that is, that we have collected enough time series data both before and after the intervention so that a meaningful change in the series will likely be detected. In this short paper, we present a simple methodology for doing this. It is expected that the methodology presented will be useful for sample size determination in a wide variety of traffic safety intervention analysis applications. Our method is illustrated with a proposed traffic safety study that was fund by NIH.

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13 citations in Web of Science®

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ID Code: 15763
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journals website (see hypertext link) or contact the author.
Keywords: intervention analysis, data collection, data planning, sample size, type ii error rate
DOI: 10.1016/j.aap.2007.10.007
ISSN: 0001-4575
Subjects: Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > STATISTICS (010400)
Australian and New Zealand Standard Research Classification > COMMERCE MANAGEMENT TOURISM AND SERVICES (150000) > TRANSPORTATION AND FREIGHT SERVICES (150700) > Road Transportation and Freight Services (150703)
Divisions: Current > Research Centres > Centre for Accident Research & Road Safety - Qld (CARRS-Q)
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Psychology & Counselling
Copyright Owner: Copyright 2008 Elsevier
Deposited On: 27 Nov 2008 00:00
Last Modified: 03 Oct 2011 04:20

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