Table B-17. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by NAICS Code: 2002

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]

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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.