Table B-2b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class: 2002 and 1997
Monday, July 2, 2012
Table B-2b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class: 2002 and 1997
[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]
| Hazard class and description | Value | Tons | Ton-miles | Average miles
per shipment |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CV 2002 |
CV 1997 |
Std. error of percent change |
CV 2002 |
CV 1997 |
Std. error of percent change |
CV 2002 |
CV 1997 |
Std. error of percent change |
CV 2002 |
CV 1997 |
Std. error of percent change |
|
| Total | 3.0 | 3.4 | 5.7 | 4.2 | 2.8 | 6.2 | 4.4 | 5.5 | 7.8 | 7.1 | 7.6 | 12.9 |
| Class 1, Explosives | 23.8 | 7.3 | 35.3 | 43.2 | 21.7 | 140.7 | 29.5 | S | S | 10.9 | 8.4 | 11.6 |
| Class 2, Gases | 7.9 | 6.1 | 15.7 | 15.6 | 5.0 | 25.5 | 8.9 | 13.8 | 23.5 | 29.0 | 12.8 | 50.4 |
| Class 3, Flammable liquids | 3.7 | 3.4 | 6.4 | 4.3 | 3.0 | 6.5 | 5.2 | 9.4 | 12.7 | 12.2 | 6.3 | 21.3 |
| Class 4, Flammable solids | 22.1 | 8.1 | 36.5 | 8.8 | 22.8 | 18.7 | 14.0 | 35.1 | 17.1 | 46.3 | 15.0 | 11.7 |
| Class 5, Oxidizers and organic peroxides | 21.8 | 13.7 | 31.4 | 26.8 | 12.1 | 40.3 | 25.3 | 18.7 | 29.7 | 18.7 | 13.9 | 49.2 |
| Class 6, Toxic (poison) | 11.6 | 8.8 | 11.9 | 15.9 | 16.4 | 30.3 | 22.2 | 10.9 | 37.2 | 21.3 | 13.4 | 39.0 |
| Class 7, Radioactive materials | 39.0 | 20.9 | 95.2 | 31.2 | 24.0 | 25.6 | 31.7 | 26.7 | 37.7 | S | 27.7 | S |
| Class 8, Corrosive materials | 6.9 | 20.3 | 19.9 | 9.7 | 8.1 | 11.7 | 10.1 | 17.2 | 16.9 | 14.9 | 18.6 | 34.9 |
| Class 9, Miscellaneous dangerous goods | 13.4 | 7.6 | 15.2 | 20.6 | 14.1 | 23.3 | 11.8 | 12.7 | 15.4 | 9.3 | 8.8 | 14.6 |
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.