SKEWNESS OF SPOT SPEED STUDIES

IT HAS BEEN SHOWN THAT CHANGING THE SHAPE OF THE SPOT SPEED DISTRIBUTION AT A LOCATION FROM SKEWED TO NORMAL, BY PROPER SPEED ZOONING OR OTHER MEANS, RESULTS IN A REDUCED ACCIDENT RATE. THIS PAPER DEALS WITH THE PROBLEM OF DETERMINING WHETHER A MEASURED SKEWNESS INDEX DIFFERS SIGNIFICANTLY FROM A NORMAL DISTRIBUTION. AN EMPIRICALLY DERIVED EQUATION FOR THE VARIABILITY (STANDARD ERROR) OF THE SKEWNESS INDEX IS GIVEN AND SHOWN TO BE VALID BY COMPARISON WITH THE STANDARD ERROR OF THE SKEWNESS INDEX FOR A NORMAL POPULATION. THE EQUATION PERMITS DETERMINATION OF WHETHER A PARTICULAR SPEED DISTRIBUTION IS SYMMETRICAL OR SKEWED; AND IT PERMITS COMPARISON BETWEEN TWO SKEWNESS INDEX VALUES, AS IN A BEFORE-AFTER STUDY.

  • Supplemental Notes:
    • Vol 40, No 10, PP 36-37, 40, 1 FIG, 1 TAB, 4 REF
  • Authors:
    • Bleyl, R L
  • Publication Date: 0

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Filing Info

  • Accession Number: 00228167
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 29 1972 12:00AM