US Table B–11b,,,,,,,,,,,,
"Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2002 and 1993
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"[Estimates are based on data from the 2002 and 1993 Commodity Flow Surveys. Because of rounding, estimates may not be additive]
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Mode of transportation,"
Value",,,Tons,,,Ton-miles ,,,Average miles per shipment,,
,CV ,,Std. error of percent ,CV ,,Std. error of percent ,CV ,,Std. error of percent ,CV ,,Std. error of percent 
,2002,1993,,2002,1993,,2002,1993,,2002,1993,
Total,1.3,0.8,2.2,2.0,1.6,3.1,3.7,2.7,6.0,2.9,3.0,5.4
Single modes,1.4,0.9,2.4,2.1,1.6,3.2,3.1,2.7,5.5,7.0,4.6,10.2
Truck ,1.4,1.1,2.5,2.6,1.9,3.9,2.8,1.9,4.9,3.7,1.5,4.8
Rail,6.0,3.3,8.6,5.7,3.8,8.3,6.7,4.5,10.8,6.7,1.9,7.3
Water,6.4,6.9,13.7,6.8,8.0,14.1,7.4,9.5,12.5,16.5,S,S
Air (includes truck and air),11.6,5.2,24.2,11.6,12.7,20.6,15.5,8.1,25.5,4.2,2.7,6.8
Pipeline ,6.4,9.7,19.3,6.9,10.7,18.0,S,S,S,S,S,S
Multiple modes,3.3,2.5,6.7,10.0,6.6,11.5,16.5,10.7,23.2,2.2,2.9,4.5
"Parcel, U.S.P.S. or courier",3.3,1.6,6.4,4.4,2.4,6.7,4.2,3.8,8.1,2.3,3.0,4.5
Truck and rail,13.2,15.6,17.2,12.3,9.4,16.4,7.1,9.1,13.9,3.1,6.0,6.8
Other multiple modes,18.8,9.8,28.0,15.2,8.4,15.4,23.6,14.8,32.0,10.8,7.2,15.9
Other and unknown modes,3.0,5.2,6.6,12.6,7.7,9.9,9.7,11.6,7.2,13.0,12.6,10.3
"
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.",,,,,,,,,,,,