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 17.8 11.8
Truck S S 18.2
Rail 12.2 2.9 5.2
Shallow draft 14.0 4.2 29.4
Great Lakes
Deep draft 26.9 4.6 S
Air 23.4 6.6
Parcel, USPS or courier 37.5 3.1 30.8
Pipeline S S S
Other and unknown modes S S 27.9

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.