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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Table B-11b. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1993

Monday, July 2, 2012

Table B-11b. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1993

[Estimates are based on data from the 2002 and 1993 Commodity Flow Surveys. Because of rounding, estimates may not be additive]

Excel | CSV

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1993
Std. error of percent CV
2002
CV
1993
Std. error of percent CV
2002
CV
1993
Std. error of percent CV
2002
CV
1993
Std. error of percent
Total 1.3 0.8 2.2 2.0 1.6 3.1 3.7 2.7 6.0 2.9 3.0 5.4
Single modes 1.4 0.9 2.4 2.1 1.6 3.2 3.1 2.7 5.5 7.0 4.6 10.2
Truck 1.4 1.1 2.5 2.6 1.9 3.9 2.8 1.9 4.9 3.7 1.5 4.8
Rail 6.0 3.3 8.6 5.7 3.8 8.3 6.7 4.5 10.8 6.7 1.9 7.3
Water 6.4 6.9 13.7 6.8 8.0 14.1 7.4 9.5 12.5 16.5 S S
Air (includes truck and air) 11.6 5.2 24.2 11.6 12.7 20.6 15.5 8.1 25.5 4.2 2.7 6.8
Pipeline 6.4 9.7 19.3 6.9 10.7 18.0 S S S S S S
Multiple modes 3.3 2.5 6.7 10.0 6.6 11.5 16.5 10.7 23.2 2.2 2.9 4.5
Parcel, U.S.P.S. or courier 3.3 1.6 6.4 4.4 2.4 6.7 4.2 3.8 8.1 2.3 3.0 4.5
Truck and rail 13.2 15.6 17.2 12.3 9.4 16.4 7.1 9.1 13.9 3.1 6.0 6.8
Other multiple modes 18.8 9.8 28.0 15.2 8.4 15.4 23.6 14.8 32.0 10.8 7.2 15.9
Other and unknown modes 3.0 5.2 6.6 12.6 7.7 9.9 9.7 11.6 7.2 13.0 12.6 10.3

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.