Table B-2a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class: 2002

Table B-2a. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class: 2002

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

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Hazard class and 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
Class 1, Explosives 23.8 0.3 43.2 29.5 0.1 10.9
Class 2, Gases 7.9 0.8 15.6 1.1 8.9 0.9 29.0
Class 3, Flammable liquids 3.7 1.4 4.3 1.4 5.2 1.6 12.2
Class 4, Flammable solids 22.1 0.2 8.8 14.0 0.2 46.3
Class 5, Oxidizers and organic peroxides 21.8 0.2 26.8 0.2 25.3 0.3 18.7
Class 6, Toxic (poison) 11.6 0.2 15.9 22.2 0.3 21.3
Class 7, Radioactive materials 39.0 0.3 31.2 31.7 S
Class 8, Corrosive materials 6.9 0.5 9.7 0.6 10.1 1.1 14.9
Class 9, Miscellaneous dangerous goods 13.4 0.5 20.6 0.6 11.8 0.7 9.3

KEY:
– Represents and estimate equal to zero or less than 1 unit of measure.
S Estimate does not meet publication standards b ecause 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.