Table B-14b. Estimated Standard Errors for Hazardous Material Shipment Characteristics for Toxic by Inhalation (TIH) for the United States: Percentage of Total for 2012 and 2007
(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 |
| Toxic by inhalation | 0.1 | 0.1 | 0.2 | 0.2 | 0.5 | 0.5 |
(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>.
Toxic by inhalation (TIH)—gases and volatile liquids that are toxic when inhaled.
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.