Table B-11a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by 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 of average miles
|CV||Std. error of percent||CV||Std. error of percent||CV||Std. error of percent|
|17||Gasoline and aviation turbine fuel||3.6||1.5||3.8||1.9||10.4||2.7||12.2|
|19||Coal and petroleum products, n.e.c.||11.7||0.7||12.6||1.1||13.7||1.5||19.9|
|23||Chemical products and preparations, n.e.c.||16.1||1.1||11.1||0.2||12.7||0.6||18.0|
|–||All other SCTG codes||7.7||0.9||19.5||0.3||13.1||0.7||11.4|
– 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.