Table B-1c. Estimated Standard Errors of Percentage for Hazardous Material Shipment Characteristics by Mode of Transportation: Percent of Total for 2002 and 1997

Table B-1c. Estimated Standard Errors of Percentage for Hazardous Material Shipment Characteristics by Mode of Transportation: Percent of Total for 2002 and 1997

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

Excel | CSV

Mode of transportation Value Tons Ton-miles
2002 1997 2002 1997 2002 1997
All modes
Single modes 0.2 0.2 0.2 0.2 0.9 3.1
Truck 1.4 1.6 1.3 1.9 2 2.6
For-hire truck 1.2 1.1 0.8 1.2 1.8 2
Private truck 1.3 1.2 1.3 1.1 1.1 1.2
Rail 0.4 0.7 0.3 0.5 1.6 2.9
Water 0.8 0.8 1.3 1.2 2.2 2.8
Air (includes truck and air) 0.6
Pipeline 1.2 1 1.4 1.6 S S
Multiple modes 0.2 0.2 0.2 0.2 0.9 S
Parcel, U.S.P.S. or courier 0.1
Other multiple modes 0.2 0.1 0.2 0.2 0.9 S
Other and unknown modes 0.2 0.2 0.1 - 0.4 0.1

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.