Table B-11c. Estimated Standard Errors for Hazardous Material Shipment Characteristics by Selected Commodities for the United States: 2002
Monday, July 2, 2012
Table B-11c. Estimated Standard Errors for Hazardous Material Shipment Characteristics by Selected Commodities for the United States: 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 | |||
|---|---|---|---|---|---|---|---|
| 2002 | 1997 | 2002 | 1997 | 2002 | 1997 | ||
| Total | – | – | – | – | – | – | |
| 17 | Gasoline and aviation turbine fuel | 1.5 | 1.4 | 1.9 | 0.9 | 2.7 | 4.1 |
| 18 | Fuel oils | 1.1 | 0.9 | 1.4 | 1.2 | 1.8 | 2.0 |
| 19 | Coal and petroleum products, n.e.c. | 0.7 | 0.6 | 1.1 | 0.7 | 1.5 | 1.2 |
| 20 | Basic chemicals | 1.4 | 1.6 | 2.0 | 0.8 | 2.4 | 3.5 |
| 22 | Fertilizers | 0.2 | 0.2 | 0.3 | 0.3 | 0.5 | 0.6 |
| 23 | Chemical products and preparations, n.e.c. | 1.1 | 0.4 | 0.2 | 0.1 | 0.6 | 0.3 |
| – | All other SCTG codes | 0.9 | 1.0 | 0.3 | 0.1 | 0.7 | 0.5 |
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.