Table B-2c. Estimated Standard Errors for Hazardous Material Shipment Characteristics by Hazard Class for the United States: Percentage of Total for 2012 and 2007
(Estimates are based on data from the 2012 and 2007 Commodity Flow Surveys)
|Hazard class and description||
|Class 1, Explosives||0.2||0.2||Z||0.0||0.1||0.0|
|Class 2, Gases||0.3||0.8||0.4||0.9||0.9||1.8|
|Class 3, Flammable and combustible liquid||0.6||1.2||0.4||1.1||1.5||2.0|
|Class 4, Flammable solid; spontaneously combustible material; dangerous when wet material||Z||0.1||0.1||0.2||0.5||0.3|
|Class 5, Oxidizers and organic peroxides||Z||0.0||0.1||0.1||0.4||0.4|
|Class 6, Toxic materials and infectious substances||0.1||0.4||0.1||0.1||0.2||0.4|
|Class 7, Radioactive material||0.2||0.3||S||0.0||Z||0.0|
|Class 8, Corrosive material||0.2||0.2||0.4||0.4||1.0||1.7|
|Class 9, Miscellaneous hazardous material||0.2||0.2||0.3||0.2||0.9||0.8|
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.
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.