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

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.