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 18.0 10.0
Truck 9.3 3.8 15.4
Rail 38.1 4.3 13.4
Shallow draft 39.5 2.0 26.3
Great Lakes S S 29.9
Deep draft S S S
Air 29.3 5.7
Parcel, USPS or courier 36.8 0.8 32.9
Pipeline S S S
Other and unknown modes 42.4 2.4 18.5

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.