Table B-2d. Estimated Standard Errors for Shipment Characteristics by Total Modal Activity for the United States: Annualized Growth Rate for 1997 to 2002 and 1993 to 2002

Table B-2d. Estimated Standard Errors for Shipment Characteristics by Total Modal Activity for the United States: Annualized Growth Rate for 1997 to 2002 and 1993 to 2002

[Estimates are shown as percents and are based on data from the 2002, 1997, and 1993 Commodity Flow Surveys]

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Mode of transportation Ton-miles Average miles per shipment (percent)
1997 to 2002 1993 to 2002 1997 to 2002 1993 to 2002
Total 0.9 0.5 0.8 0.5
Truck 0.7 0.3 0.9 0.4
Rail 1.9 0.9 1.3 0.9
Shallow draft 2.3 1.6 5.5 1.4
Great Lakes 4.8 2.7 3.8 3.0
Deep draft 5.0 2.7 3.5 1.5
Air 3.5 1.5 1.0 0.5
Parcel, U.S.P.S. or courier 1.2 0.5 0.7 0.4
Pipeline S S S S
Other and unknown modes 2.3 2.6 3.3 3.0

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.

NOTES:The Introduction and appendixes give information on 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, United States Data, December 2004.