Table B-10. Estimated Measures of Reliability for Shipment Characteristics by Selected Commodities for Hazardous Materials: 2002
Monday, July 2, 2012
Table B-10. Estimated Measures of Reliability for Shipment Characteristics by Selected Commodities for Hazardous Materials: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| SCTG Code | Commodity Description | Value - CV | Value - Hazardous | Tons - CV | Tons - Hazardous | Ton-miles - CV | Ton-miles - Hazardous | |||
|---|---|---|---|---|---|---|---|---|---|---|
| CV | Std. error of percent | CV | Std. error of Percent | CV | Std. error of Percent | |||||
| Total | 1.5 | 3.0 | 0.2 | 1.1 | 4.2 | 0.7 | 3.2 | 4.4 | 0.5 | |
| 17 | Gasoline and aviation turbine fuel | 3.6 | 3.6 | – | 3.8 | 3.8 | – | 10.4 | 10.4 | – |
| 18 | Fuel oils | 8.1 | 8.1 | – | 8.1 | 8.1 | – | 9.5 | 9.5 | – |
| 19 | Coal and petroleum products, n.e.c. | 9.2 | 11.7 | 2.9 | 10.7 | 12.6 | 4.2 | 12.9 | 13.7 | 4.4 |
| 20 | Basic chemicals | 9.2 | 11.1 | 3.9 | 16.0 | 19.6 | 2.9 | 13.2 | 11.9 | 4.9 |
| 22 | Fertilizers | 14.3 | 23.5 | 3.5 | 28.9 | 21.8 | 2.7 | 22.0 | 16.1 | 2.2 |
| 23 | Chemical products and preparations, n.e.c. | 4.7 | 16.1 | 2.8 | 3.7 | 11.1 | 3.3 | 6.6 | 12.7 | 3.2 |
| – | All other SCTG codes | 1.6 | 7.7 | – | 2.1 | 19.5 | – | 3.6 | 13.1 | 0.1 |
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.