Table B-2b. Estimated Measures of Reliability for Export Shipment Characteristics by Domestic Mode: 2002 and 1997

Table B-2b. Estimated Measures of Reliability for Export Shipment Characteristics by Domestic 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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Domestic mode of transportation Value Tons Ton-miles
CV 02 CV 97 Std. error of percent change 1997-2002 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 15.0 13.2 22.6
Single modes 5.8 5.1 9.1 12.4 8.1 21.4 15.2 15.2 26.8
Truck 5.9 5.6 9.5 11.1 6.9 21.1 26.0 13.3 52.3
Rail 6.3 30.1 24.8 13.6 14.0 17.8 16.1 21.1 26.2
Water 20.2 16.4 39.0 21.4 16.1 51.6 17.5 15.5 23.0
Air (including truck and air) 9.9 24.6 35.0 24.1 16.0 42.7 31.5 31.0 101.8
Pipeline S S S S S S S S S
Multiple modes 7.4 8.0 13.4 14.5 10.7 19.2 19.3 14.2 28.6
Parcel, U.S.P.S. or courier 8.1 11.5 19.9 7.8 11.4 21.1 14.4 15.9 65.5
Truck and rail 10.4 8.9 10.3 15.8 7.9 19.6 6.4 7.2 9.7
All other multiple modes 28.9 19.9 114.0 26.3 23.9 34.7 38.4 30.4 69.5
Other and unknown modes 16.4 6.5 3.7 21.1 19.2 2.1 22.2 18.8 3.6

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.