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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-15b. Estimated Standard Errors for Hazardous Material Shipment Characteristics for Packing Group I for the United States: Percentage of Total for 2012 and 2007

Monday, July 13, 2015

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(Estimates are based on data from the 2012 and 2007 Commodity Flow Surveys)

Description Value
—standard error
Tons
—standard error
Ton-miles (1) —standard error
2012 2007 2012 2007 2012 2007
Total 0.0 0.0 0.0 0.0 0.0 0.0
Packing Group I 0.9 0.9 1.1 1.2 1.8 1.7

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

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>.

Packing Groups I, II, and III reflect the level of hazard associated with the material being shipped. Packing Group I is the most rigorous.

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.