Table B-11b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Selected Commodities: 2002 and 1997

Table B-11b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Selected Commodities: 2002 and 1997

[Estimates are shown as percents and are based on data from the 2002 and 1997Commodity Flow Surveys]

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SCTG Code Commodity Description Value - CV Value - Std. error of percent change Tons - CV Tons - Std. error of percent change Ton-miles - CV Ton-miles - Std. error of percent change Average miles per shipmen t- CV Average miles per shipmen t- Std. error of percent change
2002 1997 2002 1997 2002 1997 2002 1997
  Total 3.0 3.4 5.7 4.2 2.8 6.2 4.4 5.5 7.8 7.1 7.6 12.9
17 Gasoline and aviation turbine fuel 3.6 3.8 6.7 3.8 3.5 6.3 10.4 15.0 21.0 12.2 5.6 15.3
18 Fuel oils 8.1 4.3 11.4 8.1 5.4 11.3 9.5 15.1 20.4 7.6 5.7 10.6
19 Coal and petroleum products, n.e.c. 11.7 9.1 19.4 12.6 8.7 19.4 13.7 12.1 25.3 19.9 7.9 25.8
20 Basic chemicals 11.1 13.9 17.9 19.6 7.7 28.0 11.9 14.7 16.4 13.6 20.9 45.2
22 Fertilizers 23.5 14.6 29.6 21.8 14.8 28.6 16.1 11.8 17.0 35.2 11.8 41.1
23 Chemical products and preparations, n.e.c. 16.1 4.4 23.9 11.1 10.4 26.8 12.7 7.5 24.4 18.0 9.2 32.6
All other SCTG codes 7.7 12.5 20.4 19.5 7.2 29.4 13.1 6.2 20.4 11.4 15.2 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.