The Frequency-Severity Indeterminacy

Little is known about unreported motor vehicle crashes. Whether a crash gets reported depends on its severity. By using only data about reported crashes, it is impossible to determine whether a change or difference in crash counts reflects a change or difference in crash frequency or in crash severity. This indeterminacy has practical implications. The article presents such examples as the misattribution of over-representation in reported crashes of older drivers and of trucks to causal factors related to the frequency of crash involvement. It also examines the misinterpretation by researchers of findings about the rollover propensity of SUVs. The purpose of this article is to examine the frequency-severity indeterminacy, to demonstrate the manner in which frequency and severity could be separated, and what information and techniques are needed to do so.


  • English

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Filing Info

  • Accession Number: 01013412
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 11 2005 6:41PM