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

Table B-1b. Estimated Measures of Reliability for Export Shipment Characteristics by Export Mode: 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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Export mode of transportation Value Tons
CV 02 CV 97 Std. error of percent change 1997-2002 CV 02 CV 97 Std. error of percent change 1997-2002
All modes 4.9 3.8 6.6 11.8 7.3 15.2
Single modes 4.1 4.7 6.5 12.4 7.9 16.3
Truck 6.4 13.1 19.9 6.5 8.4 12.1
Rail 8.9 37.7 29.8 16.2 30.4 46.9
Water 6.2 6.4 9.0 15.9 7.6 18.8
Air (including truck and air) 7.5 9.0 10.8 11.2 7.8 11.4
Pipeline S 35.4 S S 34.0 S
Multiple modes 18.2 8.3 92.0 14.7 27.7 883.0
Parcel, U.S.P.S. or courier 11.0 8.3 21.6 31.4 27.7 28.4
Truck and rail
All other multiple modes 27.7 15.2
Other and unknown modes 13.8 6.8 4.5 28.6 24.6 11.4

KEY:
– Represents an estimate 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

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: Research and Innovative Technologies Administration, Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Export Data, March 2005.

Updated: Saturday, May 20, 2017