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Table B-2a. Estimated Measures of Reliability for Export Shipment Characteristics by Domestic Mode of Transportation: 2012

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(Estimates are based on data from the 2012 Commodity Flow Survey)

Domestic mode of transportation Value Tons Ton-miles (1)
Coefficient of variation of number Standard error of percent Coefficient of variation of number Standard error of percent Coefficient of variation of number Standard error of percent
All modes 2.0 0.0 10.4 0.0 6.0 0.0
Single modes 2.4 0.7 11.0 2.0 6.1 1.4
Truck (2) 4.1 1.8 5.2 2.6 3.3 2.2
 For-hire truck 3.4 1.5 6.8 1.7 3.1 2.1
 Private truck 14.2 0.7 15.2 1.7 25.7 0.4
Rail 11.4 0.7 23.9 3.6 12.7 3.1
Water 21.4 1.1 11.1 1.9 23.4 1.9
 Inland water 24.4 0.5 26.3 2.8 33.4 0.8
 Deep sea 39.2 1.1 30.2 2.1 41.3 0.1
 Multiple waterways 41.4 0.2 39.7 1.4 36.3 1.9
Air (includes truck and air) 5.7 1.1 6.7 0.1 14.3 0.2
Pipeline (3) 45.3 0.5 47.1 1.6 S S
Multiple modes 3.9 0.7 23.7 2.0 15.1 1.4
Parcel, U.S. Postal Service, or courier 4.4 0.5 14.3 Z 15.5 0.1
Truck and rail 8.8 0.5 27.4 1.8 16.5 1.1
Truck and water 13.6 0.1 28.1 0.2 22.0 0.2
Rail and water 32.8 Z S S S S
Other multiple modes 10.2 Z 9.3 0.3 9.3 0.5
Other modes 0.0 0.0 0.0 0.0 0.0 0.0

KEY: S = Withheld because estimate did not meet publication standards.

Z = Rounds to zero.

(1) Ton-miles estimates are based on estimated distances traveled along a modeled transportation network. See “Mileage Calculations” section for additional information.

(2) “Truck” as a single mode includes shipments that were made by only private truck or only for-hire truck.

(3) Estimates for pipeline exclude shipments of crude petroleum (SCTG 16).

NOTES: Value-of-shipments estimates have not been adjusted for price changes. Appendix B tables provide estimated measures of sampling variability. 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/econ/cfs>.

SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2012 Economic Census: Transportation Commodity Flow Survey, December 2014.

Updated: Friday, May 19, 2017