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 40.9 21.0 127.1 46.0 37.6 47.8 29.4 30.0 66.0 43.8 S S
Single modes 42.7 25.5 165.1 45.7 37.8 47.5 33.8 33.1 85.1 27.9 S S
Truck 42.7 25.9 169.2 45.7 37.8 47.5 33.8 38.5 102.7 30.7 25.2 52.2
Rail S S S S S S 31.6
Water S S S S S S 30.0
Air (including truck and air) S S S S S S 26.1
Pipeline S S S S S S
Multiple modes 29.7 S S 40.0 S S S S S 14.8 31.1 49.2
Parcel, USPS or courier 29.7 S S 40.0 S S S S S 14.8 31.1 49.2
Truck and rail
Other Multiple modes
Other and unknown modes S S S S S S S S S 21.0 S 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.