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Table B–1a. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002

[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]

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Mode of Transportation Value Tons Ton-miles CV of Average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
Total 1.3 – 2.0 – 3.7 – 2.9
Single modes 1.4 0.3 2.1 0.5 3.1 0.7 7.0
Truck 1.4 0.4 2.6 1.0 2.8 1.5 3.7
For-hire truck 2.3 0.6 3.6 1.0 3.1 1.2 2.6
Private truck 1.6 0.5 3.4 0.8 3.9 0.4 4.2
Rail 6.0 0.2 5.7 0.7 6.7 1.3 6.7
Water 6.4 – 6.8 0.4 7.4 0.7 16.5
Shallow draft 8.6 – 7.9 0.3 10.3 0.7 15.2
Great Lakes 29.1 – 22.3 – 24.5 0.1 15.0
Deep draft 15.4 – 18.0 0.3 19.2 0.4 28.6
Air (incl truck and air) 11.6 0.4 11.6 – 15.5 – 4.2
Pipeline 6.4 0.1 6.9 0.4 S S S
Multiple modes 3.3 0.4 10.0 0.2 16.5 0.8 2.2
Parcel, U.S.P.S. or courier 3.3 0.3 4.4 – 4.2 – 2.3
Truck and rail 13.2 0.1 12.3 – 7.1 0.1 3.1
Truck and water 26.4 – 16.6 – 18.5 0.2 9.4
Rail and water 16.6 – 23.0 0.2 35.1 0.9 21.0
Other multiple modes 31.8 – 30.7 – 25.2 0.1 S
Other and unknown modes 3.0 0.1 12.6 0.4 9.7 0.2 13.0

KEY:
– Represents data cell equal to zero or less than 1 unit of measure.
S Estimate does not meet publication standards because of high sampling variability or poor response quality.
CV Coefficient of variation of number.

NOTES: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.

SOURCE: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, United States Data, December 2004.
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