Table B-9c. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Rail for Selected UN Numbers: 2002

Table B-9c. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Rail for Selected UN Numbers: 2002

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

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UN number 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 7.7 6.6 5.8 2.6
1010 Butadienes, stabilized S S S S S S 17.4
1017 Chlorine 11.8 0.2 12.8 0.4 15.7 0.4 14.3
1055 Isobutylene see also Petroleum gases, liquefied S S S S S S 30.0
1075 Petroleum gases 32.4 3.7 29.3 2.9 28.4 2.3 6.0
1086 Vinyl chloride, stabilized 17.2 0.3 17.1 0.3 16.0 0.3 12.6
1203 Gasoline 23.9 0.8 34.9 1.9 43.3 1.4 18.3
1230 Methanol S S S S S S 25.0
1268 Petroleum distillates, n.o.s. 24.0 0.4 29.0 0.5 28.5 0.5 11.0
1805 Phosphoric acid, liquid 30.4 0.7 35.3 0.6 41.5 1.1 6.5
1824 Sodium hydroxide solution 24.9 0.5 14.4 0.7 15.9 0.8 5.4
1830 Sulfuric acid 37.9 0.1 S S S S 29.2
1863 Fuel, aviation, turbine engine 39.4 1.1 39.1 1.6 40.4 1.0 23.5
1910 Calcium oxide S S S S S S 29.8
1964 Hydrocarbon gas mixture, compressed, n.o.s. 19.4 0.5 31.4 0.7 30.9 1.1 8.6
1987 Alcohols, n.o.s. 25.3 1.5 26.1 1.1 28.9 1.3 15.5
1993 Flammable liquids, n.o.s. 21.8 0.8 21.1 1.1 25.8 1.3 10.0
1999 Tars, liquid 41.6 0.3 41.9 0.7 S S 23.5
2448 Sulfur, molten S S 30.2 0.8 23.4 0.5 15.9
3082 Environmentally hazardous substances, liquid, n.o.s. 31.1 1.2 23.7 0.4 22.9 0.5 7.7
3257 Elevated temperature liquid, n.o.s. 19.9 1.0 25.9 2.0 21.2 2.3 6.3
All other 12.5 4.4 10.9 3.4 8.3 2.8 6.1

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.