Table B-2c. Estimated Standard Error of Percentage for Hazardous Material Shipment Characteristics by Hazard Class: Percent of Total for 2002 and 1997

Table B-2c. Estimated Standard Error of Percentage for Hazardous Material Shipment Characteristics by Hazard Class: Percent of Total for 2002 and 1997

[For explanation of terms and abreviations and symbols, see introductory text]

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Hazard class and description Value Tons Ton-miles
2002 1997 2002 1997 2002 1997
Total
Class 1, Explosives 0.3 0.1 S
Class 2, Gases 0.8 0.5 1.1 0.4 0.9 1.0
Class 3, Flammable liquids 1.4 1.3 1.4 0.7 1.6 3.5
Class 4, Flammable solids 0.2 0.2 0.2 1.0
Class 5, Oxidizers and organic peroxides 0.2 0.1 0.2 0.3 0.3
Class 6, Toxic (poison) 0.2 0.2 0.3
Class 7, Radioactive materials 0.3 0.1
Class 8, Corrosive materials 0.5 1.2 0.6 0.4 1.1 2.4
Class 9, Miscellaneous dangerous goods 0.5 0.3 0.6 0.5 0.7 0.9

KEY:
– Represents and 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.

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.