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
|CV||Std. error of percent||CV||Std. error of percent||CV||Std. error of percent|
|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|
|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|
– 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.