Table B-9. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for State of Origin: 2002 and 1997

Table B-9. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for State of Origin: 2002 and 1997

[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 Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes 14.5 5.3 22.4 13.4 13.7 21.8 19.1 28.8 34.7 9.6 8.3 20.1
Single modes 16.5 6.3 25.3 14.1 13.8 22.9 19.8 27.2 45.4 25.7 16.5 52.0
Truck 18.1 8.8 30.6 17.5 19.5 30.5 13.1 8.1 33.7 21.1 18.6 45.4
Rail 29.6 19.1 35.8 25.0 31.1 42.6 32.1 36.4 46.7 11.5 20.5 35.8
Water
Air (including truck and air) 24.7 14.5 26.2 S 22.4 S S 27.9 S 3.6 1.8 5.1
Pipeline 19.9 26.1 35.0 21.0 30.4 58.4 S S S S S S
Multiple modes 10.6 3.7 17.3 39.7 S S 43.6 S S 4.1 3.9 6.4
Parcel, USPS or courier 11.0 3.8 18.4 13.1 12.0 24.6 16.9 12.7 41.3 4.1 3.9 6.4
Truck and rail 40.6 S S S S S S S S 34.6 17.0 25.1
Other Multiple modes 34.0 S S 40.4 S S 46.0 S S 38.9 21.4 18.3
Other and unknown modes 26.3 13.8 46.9 36.3 39.1 282.9 33.7 S S 48.3 23.9 108.4

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.