Table B-4. Estimated Measures of Reliability for Hazardous Versus Nonhazardous Material Shipment Characteristics by Mode of Transportation for the United States: 2012
(Estimates are based on data from the 2012 Commodity Flow Survey)
Mode of transportation | Tons | Ton-miles (1) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Coefficient of variation of number | Hazardous | Nonhazardous | Coefficient of variation of number | Hazardous | Nonhazardous | |||||
Coefficient of variation of number | Standard error of percent of total | Coefficient of variation of number | Standard error of percent of total | Coefficient of variation of number | Standard error of percent of total | Coefficient of variation of number | Standard error of percent of total | |||
All modes | 1.8 | 3.7 | 0.7 | 1.8 | 0.7 | 3.7 | 6.2 | 0.6 | 3.8 | 0.6 |
Single modes | 1.8 | 3.7 | 0.7 | 1.8 | 0.7 | 4.4 | 6.0 | 0.5 | 4.4 | 0.5 |
Truck (2) | 1.5 | 3.7 | 0.6 | 1.7 | 0.6 | 1.6 | 6.0 | 0.4 | 1.7 | 0.4 |
For-hire truck | 2.1 | 4.9 | 1.2 | 3.2 | 1.2 | 1.6 | 5.0 | 0.3 | 1.9 | 0.3 |
Private truck | 1.4 | 7.5 | 1.2 | 1.7 | 1.2 | 3.4 | 11.2 | 1.4 | 2.4 | 1.4 |
Rail | 8.0 | 6.2 | 0.3 | 8.2 | 0.3 | 9.1 | 6.9 | 0.4 | 9.4 | 0.4 |
Water | 13.2 | 28.2 | 5.8 | 15.4 | 5.8 | 14.9 | 17.4 | 3.9 | 17.7 | 3.9 |
Inland water | 16.4 | 30.6 | 6.7 | 22.2 | 6.7 | 17.3 | 28.7 | 5.5 | 22.7 | 5.5 |
Great Lakes | 19.5 | 0.0 | 0.0 | 19.5 | 0.0 | 23.3 | 0.0 | 0.0 | 23.3 | 0.0 |
Deep sea | 25.2 | 36.9 | 10.3 | 30.0 | 10.3 | 30.1 | 36.7 | 12.5 | 18.0 | 12.5 |
Multiple waterways | 25.8 | 42.7 | 9.7 | 22.2 | 7.8 | 22.9 | 43.8 | 9.5 | 23.6 | 7.2 |
Air (includes truck and air) | 7.2 | 29.3 | 1.7 | 8.0 | 1.7 | 13.4 | 38.4 | 1.2 | 13.3 | 1.2 |
Pipeline (3) | 11.0 | 11.0 | 0.3 | 19.4 | 0.3 | S | S | S | S | S |
Multiple modes | 7.0 | 30.9 | 2.3 | 8.1 | 2.3 | 7.1 | 45.8 | 3.3 | 5.7 | 3.3 |
Parcel, U.S. Postal Service, or courier | 3.0 | 9.0 | 0.1 | 3.0 | 0.1 | 2.6 | 10.4 | 0.1 | 2.6 | 0.1 |
Truck and rail | 7.2 | 15.6 | 1.7 | 8.3 | 1.7 | 5.7 | 14.0 | 1.5 | 6.6 | 1.5 |
Truck and water | 22.7 | S | S | 23.0 | 4.8 | 38.5 | S | S | 22.7 | 9.4 |
Rail and water | 20.1 | 42.5 | 9.3 | 22.9 | 7.4 | 26.2 | 33.3 | 1.7 | 26.7 | 1.5 |
Other multiple modes | 36.6 | 0.0 | 0.0 | 36.6 | 0.0 | 32.2 | 0.0 | 0.0 | 32.2 | 0.0 |
Other modes | 18.1 | 0.0 | 0.0 | 18.1 | 0.0 | 22.7 | 0.0 | 0.0 | 22.7 | 0.0 |
KEY: S = Withheld because estimate did not meet publication standards.
(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: 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.