Table B-15a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics for Packing Group I: 2002
Monday, July 2, 2012
Table B-15a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics for Packing Group I: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| Description | Value | Tons | Ton-miles | |||
|---|---|---|---|---|---|---|
| CV | Std. error of percent | CV | Std. error of percent | CV | Std. error of percent | |
| Total | 3.0 | – | 4.2 | – | 4.4 | – |
| Packing Group I | 5.8 | 0.9 | 6.0 | 1.0 | 7.0 | 2.1 |
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.