US Table B–1a,,,,,,,
"Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002
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"[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
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Mode of Transportation,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,1.3,—,2.0,—,3.7,—,2.9
Single modes,1.4,0.3,2.1,0.5,3.1,0.7,7.0
Truck,1.4,0.4,2.6,1.0,2.8,1.5,3.7
For-hire truck,2.3,0.6,3.6,1.0,3.1,1.2,2.6
Private truck,1.6,0.5,3.4,0.8,3.9,0.4,4.2
Rail,6.0,0.2,5.7,0.7,6.7,1.3,6.7
Water,6.4,—,6.8,0.4,7.4,0.7,16.5
Shallow draft,8.6,—,7.9,0.3,10.3,0.7,15.2
Great Lakes,29.1,—,22.3,—,24.5,0.1,15.0
Deep draft,15.4,—,18.0,0.3,19.2,0.4,28.6
Air (incl truck and air),11.6,0.4,11.6,—,15.5,—,4.2
Pipeline,6.4,0.1,6.9,0.4,S,S,S
Multiple modes,3.3,0.4,10.0,0.2,16.5,0.8,2.2
"Parcel, U.S.P.S. or courier",3.3,0.3,4.4,—,4.2,—,2.3
Truck and rail,13.2,0.1,12.3,—,7.1,0.1,3.1
Truck and water,26.4,—,16.6,—,18.5,0.2,9.4
Rail and water,16.6,—,23.0,0.2,35.1,0.9,21.0
Other multiple modes,31.8,—,30.7,—,25.2,0.1,S
Other and unknown modes,3.0,0.1,12.6,0.4,9.7,0.2,13.0
"
KEY: 
— Represents data cell equal to zero or less than 1 unit of measure.  
S Estimate does not meet publication standards because of high sampling variability or poor response quality. 
CV Coefficient of variation of number.",,,,,,,
"NOTES: 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, United States Data, December 2004.",,,,,,,