Table B-2a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class: 2002
Monday, July 2, 2012
Table B-2a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| Hazard class and description | Value | Tons | Ton-miles | CV of Average miles per shipment |
|||
|---|---|---|---|---|---|---|---|
| CV | Std. error of percent | CV | Std. error of percent | CV | Std. error of percent | ||
| Total | 3.0 | – | 4.2 | – | 4.4 | – | 7.1 |
| Class 1, Explosives | 23.8 | 0.3 | 43.2 | – | 29.5 | 0.1 | 10.9 |
| Class 2, Gases | 7.9 | 0.8 | 15.6 | 1.1 | 8.9 | 0.9 | 29.0 |
| Class 3, Flammable liquids | 3.7 | 1.4 | 4.3 | 1.4 | 5.2 | 1.6 | 12.2 |
| Class 4, Flammable solids | 22.1 | 0.2 | 8.8 | – | 14.0 | 0.2 | 46.3 |
| Class 5, Oxidizers and organic peroxides | 21.8 | 0.2 | 26.8 | 0.2 | 25.3 | 0.3 | 18.7 |
| Class 6, Toxic (poison) | 11.6 | 0.2 | 15.9 | – | 22.2 | 0.3 | 21.3 |
| Class 7, Radioactive materials | 39.0 | 0.3 | 31.2 | – | 31.7 | – | S |
| Class 8, Corrosive materials | 6.9 | 0.5 | 9.7 | 0.6 | 10.1 | 1.1 | 14.9 |
| Class 9, Miscellaneous dangerous goods | 13.4 | 0.5 | 20.6 | 0.6 | 11.8 | 0.7 | 9.3 |
KEY:
– Represents and estimate equal to zero or less than 1 unit of
measure.
S Estimate does not meet publication standards b ecause of highly sampling
variability or poor response quality.
CV Coefficient of variation of number
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.