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Table B-11c. Estimated Standard Errors for Hazardous Material Shipment Characteristics by Selected Commodities for the United States: 2002

[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]

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SCTG Code Commodity Description Value Tons Ton–miles
2002 1997 2002 1997 2002 1997
Total – – – – – –
17 Gasoline and aviation turbine fuel 1.5 1.4 1.9 0.9 2.7 4.1
18 Fuel oils 1.1 0.9 1.4 1.2 1.8 2.0
19 Coal and petroleum products, n.e.c. 0.7 0.6 1.1 0.7 1.5 1.2
20 Basic chemicals 1.4 1.6 2.0 0.8 2.4 3.5
22 Fertilizers 0.2 0.2 0.3 0.3 0.5 0.6
23 Chemical products and preparations, n.e.c. 1.1 0.4 0.2 0.1 0.6 0.3
– All other SCTG codes 0.9 1.0 0.3 0.1 0.7 0.5

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.
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