Table B-2. Estimated Measures of Reliability for Shipment Characteristics by Total Modal Activity for State of Origin: 2002

Table B-2. Estimated Measures of Reliability for Shipment Characteristics by Total Modal Activity for State 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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Mode of transportation Ton-miles CV of average miles
per shipment
CV Std. error of percent
Total 23.4 22.9
Truck 31.5 6.2 17.0
Rail 36.6 12.7 22.8
Shallow draft S S S
Great Lakes
Deep draft S S 26.7
Air 21.0 0.5 13.4
Parcel, USPS or courier S S 30.5
Pipeline S S S
Other and unknown modes 28.2 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, Individual State Data, December 2004.