Appendix B to Part 1240 - Procedures for Missing or Inadequate State-Submitted Information (Calendar Years 1996 and 1997)
23:1.0.2.14.8.4.1.1.43 : Appendix B
Appendix B to Part 1240 - Procedures for Missing or Inadequate
State-Submitted Information (Calendar Years 1996 and 1997)
A. If State-submitted seat belt use rate information is
unavailable or inadequate for both calendar years 1996 and 1997,
State seat belt use rates for calendars year 1996 and 1997 will be
estimated based on seat belt use rates of fatally-injured
occupants. Data from the Fatality Analysis Reporting System (FARS)
will be translated into estimated observed seat belt use rates
using an algorithm that relates historical belt use by
fatally-injured occupants to observed use. 1
1 Blincoe, L.J. Estimating the Benefits of Increased Safety
Belt Use. Washington, DC: U.S. Department of Transportation,
NHTSA, DOT HS 808 133, June, 1994.
B. The algorithm is as follows:
u = (−.221794 + √.049193 + .410769F) / .456410 Where: u = the
estimated observed seat belt use F = the seat belt use in
potentially fatal crashes
In the above formula, F is calculated as follows:
F = (f / (1 − e)) / ((f / (1 − e)) + 1 − f) Where: F = the seat
belt use in potentially fatal crashes e = State-specific weighted
average effectiveness of seat belts in passenger cars and passenger
motor vehicles that are not passenger cars f = State-specific seat
belt use rate of fatally-injured occupants of passenger vehicles
C. If State-submitted seat belt use rate information is
available for either calendar year 1996 or 1997, but not both, a
State seat belt use rate for the year for which information is
missing will be estimated by calculating the percent change in the
FARS-based observed seat belt use rate (derived from the above
algorithm) between the two years. This factor will then be applied
to the seat belt use rate from the known year to derive an estimate
of the seat belt use rate for the unknown year.