A NON-PARAMETRIC TEST OF THE IDENTITY OF TWO INCREASING REGRESSION FUNCTIONS - WITH AN APPLICATION TO THE ANALYSIS OF SPEED LIMIT EXPERIMENTS

In Swedish accident analysis the regression of the traffic volume (the number of vehicle-kilometers travelled) on the number of accidents is mostly used. It is reasonable to assume that the mean number of accidents increases with traffic volume. In this paper a test is developed which makes it possible to compare two increasing regression functions. Some assumptions are made regarding the form of the distributions. The test is basically a (conservative) rank test. Firstly the mathematical derivation of the test is carried out. The test is applied to data from experiments during 1962 in order to find out if for a given traffic volume the number of accidents on days on which there is a general speed limit is (stochastically) less than on days on which there is no speed limit. /TRRL/

Media Info

  • Features: Figures; References;
  • Pagination: 18 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00182716
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: VTI Rpt. No. 82 Monograph
  • Files: ITRD, TRIS
  • Created Date: Nov 14 1978 12:00AM