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Table B–2. Estimated Measures of Reliability for Inbound Shipment Characteristics by Mode of Transportation for CBSA of Destination: 2002

[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]

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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
All modes 6.4 – 12.3 – 10.6 – 8.7
Single modes 7.4 1.2 12.6 0.4 11.0 0.5 21.4
Truck 6.2 1.4 8.5 5.1 7.3 5.2 20.0
Rail 46.1 1.4 19.4 1.5 19.7 3.3 4.8
All other Single modes 28.2 1.5 S S S S 5.2
Multiple modes 8.3 1.0 14.0 0.2 6.4 0.3 7.3
Parcel, USPS or courier 8.4 0.9 7.9 – 9.4 0.1 7.3
All other multiple modes 27.3 0.3 22.3 0.2 10.3 0.2 5.9
Other and unknown modes 21.1 0.6 17.4 0.3 18.0 0.3 S

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

NOTE: The Introduction and appendixes give information onf 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, Metropolitan Data, December 2004.
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