Table B-12a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Truck for Intrastate vs Interstate for Selected Commodities: 2002
Monday, July 2, 2012
Table B-12a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Truck for Intrastate vs Interstate for 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 | Intrastate std. error of percentage | Interstate std. error of percentage | CV | Intrastate std. error of percentage | Interstate std. error of percentage | CV | Intrastate std. error of percentage | Interstate std. error of percentage | ||
| Total | 3.7 | 1.5 | 1.5 | 4.6 | 1.5 | 1.5 | 7.0 | 3.2 | 3.2 | |
| 17 | Gasoline and aviation turbine fuel | 5.2 | 2.2 | 2.2 | 5.9 | 2.2 | 2.2 | 11.8 | 7.1 | 7.1 |
| 18 | Fuel oils | 5.7 | 1.0 | 1.0 | 6.0 | 1.4 | 1.4 | 11.3 | 5.6 | 5.6 |
| 19 | Coal and petroleum products, n.e.c. | 15.6 | 3.5 | 3.5 | 19.0 | 3.5 | 3.5 | 22.6 | 5.3 | 5.3 |
| 20 | Basic chemicals | 11.4 | 4.5 | 4.5 | 17.6 | 3.1 | 3.1 | 12.6 | 2.6 | 2.6 |
| 22 | Fertilizers | 33.1 | 4.9 | 4.9 | 32.0 | 4.5 | 4.5 | 32.6 | S | 3.5 |
| 23 | Chemical products and preparations, n.e.c. | 17.5 | 4.4 | 4.4 | 13.1 | 5.1 | 5.1 | 16.7 | 2.1 | 2.1 |
| – | All other SCTG codes | 8.5 | 2.1 | 2.1 | 18.6 | 3.7 | 3.7 | 14.9 | 1.3 | 1.3 |
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.