Table B-1b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Mode of Transportation: 2002 and 1997

Table B-1b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Mode of Transportation: 2002 and 1997

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

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Mode of transportation Value Tons Ton-miles Average miles
per shipment
CV
2002
CV
1997
Std. error of percent
change
CV
2002
CV
1997
Std. error of percent
change
CV
2002
CV
1997
Std. error of percent
change
CV
2002
CV
1997
Std. error of percent
change
All modes 3.0 3.4 5.7 4.2 2.8 6.2 4.4 5.5 7.8 7.1 7.6 12.9
Single modes 3.1 3.4 5.8 4.2 2.8 6.2 4.9 5.7 8.5 6.1 6.7 10.6
Truck 3.7 3.5 6.5 4.6 4.5 7.8 7.0 8.5 14.8 6.3 5.0 10.0
For-hire truck 5.2 6.3 10.8 6.2 7.5 11.8 9.4 12.7 20.9 7.4 5.5 10.4
Private truck 4.8 3.1 7.4 5.3 3.3 7.7 7.9 9.0 16.6 5.3 4.1 7.2
Rail 7.7 15.5 15.5 6.6 8.9 11.9 5.8 12.2 12.4 2.6 6.0 5.4
Water 12.5 11.3 23.9 14.3 13.2 26.5 12.0 14.5 21.0 S S S
Air (includes truck and air) 20.7 46.4 9.7 38.0 19.2 37.2 39.2 20.1 37.3 8.2 3.5 12.8
Pipeline 6.6 5.1 11.2 7.0 6.3 11.9 S S S S S S
Multiple modes 14.9 11.1 24.8 24.3 25.4 53.8 19.9 S S 12.8 8.9 20.3
Parcel, U.S.P.S. or courier 14.6 11.6 25.0 20.2 25.3 39.3 13.0 16.4 26.6 13.2 8.1 18.6
Other multiple modes 23.6 14.5 37.0 24.7 25.6 54.6 20.1 S S 22.6 44.0 404.9
Other and unknown modes 18.7 12.5 15.1 19.0 9.5 15.7 46.0 20.4 62.5 39.0 33.1 88.6

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.
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.