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 9.4 7.7
Truck 10.3 4.4 7.8
Rail 16.3 2.3 8.2
Shallow draft
Great Lakes 29.4 3.0 15.1
Deep draft S S S
Air 31.0 5.0
Parcel, USPS or courier 30.7 0.1 26.5
Pipeline S S S
Other and unknown modes 31.3 0.5 41.2

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.