Table B-20 - Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for State of Origin: 2002 and 1997

Table B-20 - Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and 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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All Commodities

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 6.9 8.6 13.8 8.1 10.6 13.4 12.4 34.2 26.9 15.1 13.6 26.3
Single modes 6.8 10.0 14.1 12.8 15.3 20.5 13.5 35.6 27.7 14.6 18.3 19.9
Truck 7.2 5.7 12.2 13.9 12.1 27.5 18.4 16.9 27.5 13.9 9.8 18.9
Rail 13.4 29.7 26.0 16.5 33.3 24.0 13.2 43.2 29.7 6.8 14.2 17.7
Water S S S S S S 31.6
Air (including truck and air) 32.7 28.0 45.5 S 29.5 S S 31.7 S 15.7 15.0 18.2
Pipeline S S S S S S S S S S S S
Multiple modes 14.3 13.4 31.5 S 21.1 S S 24.6 S 14.1 8.9 17.1
Parcel, USPS or courier 14.2 12.9 32.3 26.0 13.4 58.9 27.8 20.3 66.5 14.1 9.0 17.1
Truck and rail S 36.7 S S 27.0 S S 28.0 S 30.4 16.3 42.8
Other multiple modes S S S S S S 26.3
Other and unknown modes 30.2 18.3 88.4 17.3 26.3 30.5 16.2 36.9 27.7 S S S

SCTG 01-05, Agriculture products and fish

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 19.5 18.3 21.5 24.9 23.9 26.4 20.4 43.0 28.6 11.8 30.9 29.3
Single modes 19.4 18.6 21.7 24.9 24.2 26.5 21.6 43.1 28.4 11.6 30.0 27.4
Truck 22.3 15.5 26.9 34.1 18.3 37.4 34.5 23.7 36.7 17.7 42.7 47.6
Rail 20.6 38.3 26.6 22.8 38.3 27.6 20.0 49.0 28.5 11.2 12.4 16.3
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes S S S S 45.4 S S 43.6 S 35.7 26.8 31.0
Parcel, USPS or courier S S S S S S S S S 27.4 31.6 35.1
Truck and rail S S 45.3 43.5 26.3
Other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S S S S S S S

SCTG 06-09, Grains, alcohol, and tobacco products

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 10.6 12.2 21.6 15.7 13.8 39.2 18.3 13.1 44.1 22.0 19.3 23.3
Single modes 10.8 12.0 21.6 15.8 13.5 39.8 18.3 13.5 45.7 20.9 18.8 23.5
Truck 13.0 14.7 23.7 20.8 18.3 45.5 28.5 24.6 50.8 15.6 19.5 19.3
Rail 10.0 11.4 24.1 13.3 12.0 38.4 17.7 13.4 51.2 6.5 6.0 9.4
Water S S S S S S 31.6
Air (including truck and air)
Pipeline S S S S S S S S S S
Multiple modes S S S S S S S S S 29.0 28.7 16.3
Parcel, USPS or courier S S S S S S S S S 29.0 30.7 16.5
Truck and rail S S S S S S S S S 31.6 30.1 35.8
Other multiple modes
Other and unknown modes 38.6 S S 40.0 S S S S S S S S

SCTG 10-14, Stones, non-metallic minerals, and metallic ores

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 37.7 49.9 36.1 40.9 S S 41.4 S S S 42.4 S
Single modes 37.7 35.2 63.4 40.9 S S 41.4 S S S 24.6 S
Truck 37.7 35.2 63.4 40.9 S S 41.4 S S S 24.6 S
Rail
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes S 46.0 S S 48.0 S S S S 31.6 23.3 4.7
Parcel, USPS or courier S 46.0 S S 48.0 S S S S 31.6 23.3 4.7
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S 25.4

SCTG 15-19, Coal and petroleum products

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 13.7 20.6 30.5 14.3 20.7 27.2 19.5 25.1 25.1 16.5 22.0 19.9
Single modes 15.5 21.4 33.4 16.0 15.8 32.8 30.9 27.6 30.1 21.8 27.1 24.0
Truck 15.2 28.2 57.3 17.6 30.2 102.1 13.9 30.1 47.6 23.3 28.2 22.9
Rail S 33.2 S 47.6 36.8 25.5 S 31.1 S 35.9 S S
Water
Air (including truck and air)
Pipeline S S S S S S S S S S
Multiple modes S S S S S S S S S 37.5 34.5 170.5
Parcel, USPS or courier S S S S S S S S S 31.6 34.5 29.8
Truck and rail S S S S S S 31.6
Other multiple modes
Other and unknown modes 15.6 26.1 31.7 17.1 26.3 30.4 21.4 31.5 33.6 29.3 21.8 10.9

SCTG 20-24, Pharmaceutical and chemical products

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 16.3 19.9 42.2 44.1 30.7 77.4 36.0 33.5 88.8 21.3 34.9 230.1
Single modes 11.1 22.1 34.3 45.5 30.7 78.4 38.4 34.0 89.7 22.3 20.2 33.3
Truck 10.2 22.1 33.2 45.5 31.1 80.8 38.4 26.9 123.3 22.3 19.1 34.4
Rail S S S S S S 31.6
Water
Air (including truck and air) S S S S S S S S S 29.9 26.0 27.6
Pipeline S S S S S S
Multiple modes 39.0 31.0 204.7 38.1 37.5 162.2 38.0 21.0 225.6 14.6 24.3 73.3
Parcel, USPS or courier 39.0 31.0 204.7 38.1 37.5 162.2 38.0 21.0 225.6 14.6 24.3 73.3
Truck and rail
Other multiple modes
Other and unknown modes S 38.4 S S 38.7 S 47.0 24.9 168.6 22.5 S S

SCTG 25-30, Logs, wood products, and textile and leather

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 19.1 45.2 54.0 25.7 15.3 47.3 18.8 25.8 51.2 15.4 21.0 37.5
Single modes 15.9 48.1 49.1 25.6 15.6 46.3 19.7 26.5 51.9 24.9 12.3 35.3
Truck 15.9 48.1 49.1 25.6 15.6 46.3 19.7 26.5 51.9 22.7 13.0 33.6
Rail
Water
Air (including truck and air) S S S S S S S S S 29.9 41.2 194.5
Pipeline S S S S S S
Multiple modes S 30.4 S 33.8 21.1 63.6 30.1 22.4 85.0 9.7 15.9 17.7
Parcel, USPS or courier S 30.4 S 33.8 21.1 63.6 30.1 22.4 85.0 9.7 15.9 17.7
Truck and rail
Other multiple modes
Other and unknown modes S 47.8 S S 38.9 S S 38.3 S 38.7 S S

SCTG 31-34, Base metal and machinery

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 19.4 7.9 50.9 28.2 40.2 58.0 27.1 13.0 89.0 S 26.3 S
Single modes 21.3 8.1 57.0 28.7 40.8 58.9 28.6 11.7 95.7 40.8 25.3 42.5
Truck 22.2 8.3 58.3 28.8 40.9 58.9 29.7 12.2 99.5 45.7 18.9 61.6
Rail S S S S S S S S S 26.2 29.8 71.1
Water
Air (including truck and air) S S S S S S S S S 28.1 28.4 25.5
Pipeline S S S S S S
Multiple modes 33.0 28.1 81.7 38.8 28.5 109.2 47.8 38.7 103.0 31.2 18.6 27.5
Parcel, USPS or courier 33.6 27.0 83.5 40.1 22.3 128.5 S 33.1 S 31.4 18.6 27.5
Truck and rail S S S S S S 29.8
Other multiple modes S S S S S S 29.8
Other and unknown modes S 43.2 S 41.9 S S 40.5 S S S S S

SCTG 35-38, Electronic, motorized vehicles, and precision instruments

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 20.6 21.4 51.1 22.4 36.9 67.4 34.3 S S 20.1 20.0 24.6
Single modes 11.0 32.2 44.8 25.5 41.3 58.0 32.0 S S 30.9 35.5 34.6
Truck 12.2 33.8 45.4 25.6 41.5 54.2 34.5 S S 31.1 19.3 55.4
Rail S S S S S S 26.8
Water
Air (including truck and air) 49.8 34.4 39.3 49.4 46.1 21.2 S 48.1 S 22.5 15.9 31.3
Pipeline S S S S S S
Multiple modes 29.0 16.0 40.3 44.7 13.8 61.5 30.2 13.0 37.2 30.9 13.3 21.0
Parcel, USPS or courier 29.0 16.0 40.3 44.8 13.8 61.5 30.2 13.0 37.2 30.8 13.3 20.9
Truck and rail
Other multiple modes S S S S S S 31.6
Other and unknown modes S 21.3 S 46.5 27.8 405.8 S 39.6 S S 35.0 S

SCTG 39-43, Furniture, mixed freight and misc manufactured products

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 12.5 18.7 20.0 24.2 44.1 26.4 S 21.2 S 26.2 28.5 38.4
Single modes 13.6 21.1 22.7 24.4 44.9 27.4 S 19.0 S 14.8 38.7 51.0
Truck 14.0 21.3 22.9 15.0 46.9 23.2 25.7 24.4 19.5 14.7 38.6 49.0
Rail S 47.6 S S S S S S S 31.6 26.9 36.3
Water
Air (including truck and air) S S S S S S 29.8
Pipeline S S S S S S
Multiple modes 18.2 22.5 21.3 30.6 46.3 6.6 24.3 S S 15.6 11.0 16.1
Parcel, USPS or courier 18.2 29.0 29.9 30.6 43.6 58.0 24.3 48.4 47.7 15.6 11.1 16.2
Truck and rail S S S S S S 27.9
Other multiple modes
Other and unknown modes S S S 42.4 S S S S S S S S

Commodity Unknown

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 S S S S S S 47.9 S S S S S
Single modes S S S S S S 46.5 S S S S S
Truck S S S S S S S S S 21.0 S S
Rail S S S S S S S S S 29.1 31.6 150.1
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes S S S S S S S S S 26.6 31.6 380.9
Parcel, USPS or courier S S S S S S S S S 26.6 31.6 380.9
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S 28.4

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.