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 9.2 5.8 13.4 14.7 10.6 19.5 S 18.3 S 46.8 20.3 65.6
Single modes 12.9 6.2 18.3 12.0 11.4 15.8 21.7 30.8 30.7 28.2 42.1 31.7
Truck 11.3 6.2 15.0 8.4 16.5 17.9 5.9 14.2 12.8 12.6 5.1 17.9
Rail
Water S 32.5 S 38.1 S S 48.7 S S 18.8 21.8 57.9
Air (including truck and air) 27.4 15.2 32.0 32.8 22.3 12.1 20.4 33.3 11.9 24.3 19.0 15.1
Pipeline 23.0 19.7 33.3 21.1 19.3 27.6 S S S S S S
Multiple modes 12.4 13.5 21.1 38.8 36.5 150.6 S 32.1 S 21.6 13.4 51.3
Parcel, USPS or courier 27.0 15.3 46.6 17.2 17.6 49.3 31.6 19.2 88.2 18.4 14.1 52.8
Truck and rail
Other Multiple modes 11.5 18.9 22.2 39.0 36.8 152.0 S 32.2 S 28.1 20.4 76.6
Other and unknown modes 22.7 17.6 23.7 34.4 36.4 38.6 36.0 32.2 10.6 S 16.2 S

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.