THE RANDOMNESS OF ACCIDENT COUNTS

Road accident occuurrence is generally assumed to be governed by a random process. Experience analysing accident count series indicates a need for testing the randomness of such a series, and a simple statistical test is described. The test is a modified one-sample runs test, which can be used to assist the identification of 3 distinct patterns constituting non-randomness (namely, a trend, a discontinuity and over-correction). The test is designed for the preliminary analysis of accident count data, and its use is demonstrated, using both artificial and actual accident count series.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00014575
• Corporate Authors:

  Pergamon Press, Incorporated

  Headington Hill Hall
  Oxford OX30BW,    
• Authors:
  • Nicholson, A J
• Publication Date: 1986-6

Media Info

• Features: Figures; Tables;
• Pagination: p. 193-198
• Serial:
  • Accident Analysis & Prevention
  • Volume: 18
  • Issue Number: 3
  • Publisher: Elsevier
  • ISSN: 0001-4575
  • Serial URL: http://www.sciencedirect.com/science/journal/00014575

Subject/Index Terms

• TRT Terms: Statistical analysis; Stochastic processes; Traffic crashes
• Subject Areas: Data and Information Technology; Safety and Human Factors;

Filing Info

• Accession Number: 00495936
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: HS-039 960
• Files: HSL, USDOT
• Created Date: Aug 31 1990 12:00AM