Table B-6. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for CBSA of Origin: 2002

Table B-6. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for CBSA of Origin: 2002

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

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All Commodities

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 9.9 20.2 15.9 26.1
Single modes 10.2 0.7 20.2 16.1 0.5 21.4
Truck 14.2 6.5 44.5 9.0 22.6 7.3 23.7
Rail 18.4 1.8 30.0 7.6 22.8 6.3 23.5
All other Single modes 35.5 6.8 29.9 8.0 28.9 10.3 25.4
Multiple modes 21.4 0.6 26.5 31.5 0.3 9.7
Parcel, USPS or courier 27.6 0.6 35.2 40.7 10.0
All other multiple modes 36.6 0.2 33.5 36.1 0.3 21.2
Other and unknown modes 19.1 0.2 19.6 36.0 0.2 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.