Figure 2
Fatality Rates for Selected Modes
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Table Version
a For air carriers, the data were dampened, or smoothed,
to reduce the month-to-month fluctuations. This dampening was performed
using an exponential smoothing model, with a weight of 0.95. Departure data,
and hence the denominator of the rates, are not strictly comparable between
pre- and post- 1977 eras.
For large air carriers, fatalities resulting from the Sept.
11, 2001, terrorist attacks include only those persons onboard aircraft.
Source: Various sources, as cited in USDOT, Bureau of Transportation
Statistics, National Transportation Statistics 2002 (Washington, DC: 2002).
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