Table B-2c. Estimated Standard Error of Percentage for Hazardous Material Shipment Characteristics by Hazard Class: Percent of Total for 2002 and 1997
Monday, July 2, 2012
Table B-2c. Estimated Standard Error of Percentage for Hazardous Material Shipment Characteristics by Hazard Class: Percent of Total for 2002 and 1997
[For explanation of terms and abreviations and symbols, see introductory text]
| Hazard class and description | Value | Tons | Ton-miles | |||
|---|---|---|---|---|---|---|
| 2002 | 1997 | 2002 | 1997 | 2002 | 1997 | |
| Total | – | – | – | – | – | – |
| Class 1, Explosives | 0.3 | – | – | – | 0.1 | S |
| Class 2, Gases | 0.8 | 0.5 | 1.1 | 0.4 | 0.9 | 1.0 |
| Class 3, Flammable liquids | 1.4 | 1.3 | 1.4 | 0.7 | 1.6 | 3.5 |
| Class 4, Flammable solids | 0.2 | – | – | 0.2 | 0.2 | 1.0 |
| Class 5, Oxidizers and organic peroxides | 0.2 | 0.1 | 0.2 | – | 0.3 | 0.3 |
| Class 6, Toxic (poison) | 0.2 | 0.2 | – | – | 0.3 | – |
| Class 7, Radioactive materials | 0.3 | 0.1 | – | – | – | – |
| Class 8, Corrosive materials | 0.5 | 1.2 | 0.6 | 0.4 | 1.1 | 2.4 |
| Class 9, Miscellaneous dangerous goods | 0.5 | 0.3 | 0.6 | 0.5 | 0.7 | 0.9 |
KEY:
– Represents and estimate equal to zero or less than 1 unit of
measure.
S Estimate does not meet publication standards because of highly sampling
variability or poor response quality.
NOTE: 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/cfs.
SOURCE: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Hazmat Data, December 2004.