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 40.4 21.3 21.0 S
Single modes 45.4 6.5 21.5 0.4 21.0 1.7 42.9
Truck 45.7 6.5 23.7 6.4 22.4 4.9 43.6
Rail S S S S S S 31.6
All other Single modes 46.2 0.9 S S S S 25.1
Multiple modes 47.1 6.6 44.1 0.4 32.7 1.7 25.3
Parcel, USPS or courier 49.6 6.7 47.7 0.4 38.1 1.8 25.3
All other multiple modes S S S S S S 31.6
Other and unknown modes 36.5 0.7 45.7 0.1 S S 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.