Table B-11a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Selected Commodities: 2002
Monday, July 2, 2012
Table B-11a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Selected Commodities: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| SCTG Code | Commodity 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 | |
| 17 | Gasoline and aviation turbine fuel | 3.6 | 1.5 | 3.8 | 1.9 | 10.4 | 2.7 | 12.2 |
| 18 | Fuel oils | 8.1 | 1.1 | 8.1 | 1.4 | 9.5 | 1.8 | 7.6 |
| 19 | Coal and petroleum products, n.e.c. | 11.7 | 0.7 | 12.6 | 1.1 | 13.7 | 1.5 | 19.9 |
| 20 | Basic chemicals | 11.1 | 1.4 | 19.6 | 2.0 | 11.9 | 2.4 | 13.6 |
| 22 | Fertilizers | 23.5 | 0.2 | 21.8 | 0.3 | 16.1 | 0.5 | 35.2 |
| 23 | Chemical products and preparations, n.e.c. | 16.1 | 1.1 | 11.1 | 0.2 | 12.7 | 0.6 | 18.0 |
| – | All other SCTG codes | 7.7 | 0.9 | 19.5 | 0.3 | 13.1 | 0.7 | 11.4 |
KEY:
– Represents an 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.
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.