Table B-17. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by NAICS Code: 2002
Monday, July 2, 2012
Table B-17. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by NAICS Code: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| NAICS 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 |
| 422700 | Petroleum and Petroleum Products Wholesalers | 4.0 | 1.1 | 5.0 | 1.3 | 14.8 | 2.2 | 8.8 |
| 324000 | Petroleum and Coal Products Manufacturing | 5.3 | 1.3 | 4.4 | 1.5 | 6.4 | 2.5 | 6.9 |
| 325000 | Chemical Manufacturing | 9.8 | 1.5 | 20.6 | 2.1 | 11.1 | 2.8 | 14.3 |
| 551114 | Corporate, Subsidiary, and Regional Managing Offices | 20.8 | 0.9 | 27.1 | 0.9 | 19.4 | 1.3 | 30.3 |
| 422600 | Chemical and Allied Products Wholesalers | 13.7 | 0.3 | 17.0 | 0.2 | 17.8 | 0.2 | 19.3 |
| – | Others | 7.8 | 1.0 | 12.8 | 0.4 | 15.1 | 0.9 | 13.6 |
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.