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Table B–11a. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1997

[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]

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Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002		 CV
1997		 Std. error of percent change CV
2002		 CV
1997		 Std. error of percent change CV
2002		 CV
1997		 Std. error of percent change CV
2002		 CV
1997		 Std. error of percent change
Total 1.3 0.9 2.0 2.0 1.6 2.8 3.7 2.3 5.3 2.9 2.6 4.4
Single modes 1.4 1.1 2.3 2.1 1.5 2.9 3.1 2.6 5.0 7.0 3.0 9.1
Truck 1.4 1.0 2.2 2.6 1.7 3.3 2.8 1.8 4.1 3.7 2.9 5.2
Rail 6.0 5.1 7.7 5.7 4.0 8.5 6.7 5.5 10.7 6.7 3.1 7.6
Water 6.4 4.8 9.4 6.8 4.7 10.4 7.4 6.1 11.3 16.5 29.9 40.1
Air (includes truck and air) 11.6 7.0 15.7 11.6 5.7 11.1 15.5 7.7 16.5 4.2 1.7 6.3
Pipeline 6.4 7.0 12.4 6.9 7.7 12.9 S S S S S S
Multiple modes 3.3 1.8 4.4 10.0 7.3 12.6 16.5 9.6 21.3 2.2 2.6 3.8
Parcel, U.S.P.S. or courier 3.3 2.0 4.6 4.4 2.7 5.9 4.2 4.0 6.6 2.3 2.6 3.8
Truck and rail 13.2 7.5 14.1 12.3 19.8 18.6 7.1 18.2 16.1 3.1 2.6 4.2
Other multiple modes 18.8 8.8 31.2 15.2 10.8 20.1 23.6 14.2 34.1 10.8 9.5 23.2
Other and unknown modes 3.0 3.4 4.4 12.6 8.4 13.0 9.7 8.5 7.9 13.0 9.6 17.1

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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