A NOTE ON THE CHI-SQUARE TEST WITH APPLICATIONS TO ROAD ACCIDENTS IN CONSTRUCTION ZONES

The routine use of chi-square tests has perhaps led to an incorrect consideration of basic underlying data in two articles in the accident and transportation fields. This paper emphasizes the necessity of comparing actual measured (observed, resultant, etc) units with those which are expected. The two detected errors found in the literature serve as a warning stimulus in using proportions or transformed units instead of the actual numbers in chi-square tests. Several examples of data preparation are exhibited in detail. In addition, road accidents in construction or maintenance zones are analyzed as an application of correct usage of the basic available data.(a) (TRRL)

• 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:
  • Ceder, Avishai (Avi)
  • DRESSLER, O
• Publication Date: 1980-3

Media Info

• Features: References; Tables;
• Pagination: p. 7-10
• Serial:
  • Accident Analysis & Prevention
  • Volume: 12
  • Issue Number: 1
  • Publisher: Elsevier
  • ISSN: 0001-4575
  • Serial URL: http://www.sciencedirect.com/science/journal/00014575

Subject/Index Terms

• TRT Terms: Before and after studies; Chi square test; Construction sites; Crashes; Data analysis; Distributions (Statistics); Errors; Highway maintenance; Maintenance; Mathematical analysis; Road construction; Statistical sampling; Traffic crashes
• ITRD Terms: 1643: Accident; 9148: Before and after study; 6572: Distribution (stat); 6440: Error; 3847: Maintenance; 3665: Road construction; 6553: Sample (stat)
• Subject Areas: Data and Information Technology; Highways; Maintenance and Preservation; Safety and Human Factors; I81: Accident Statistics;

Filing Info

• Accession Number: 00325300
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Report/Paper Numbers: HS-028 893
• Files: HSL, ITRD, TRIS
• Created Date: Aug 15 1985 12:00AM