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 8.3 6.6 14.9 10.4 7.9 17.2 11.0 2.4 16.7 9.4 5.0 12.7
Single modes 8.9 7.2 16.5 10.5 8.0 17.4 11.1 2.2 16.8 11.2 8.0 14.9
Truck 8.8 7.2 16.5 11.6 8.6 18.8 11.3 3.9 18.4 9.2 8.2 13.3
Rail 14.9 19.1 36.6 21.4 9.0 35.2 17.6 6.6 25.2 13.5 8.5 15.4
Water S 46.1 S S S S S S S 32.1 S S
Air (including truck and air) 26.6 19.3 24.5 33.0 S S 30.8 44.4 30.1 4.3 6.0 7.6
Pipeline S S S S S S S S S S
Multiple modes 14.7 11.9 20.3 24.7 9.5 31.9 25.0 16.8 33.5 5.1 7.0 11.5
Parcel, USPS or courier 16.4 12.5 22.2 17.1 11.3 17.6 14.7 11.3 18.1 5.0 7.0 11.5
Truck and rail 27.6 31.8 24.2 29.4 22.6 44.1 29.6 27.1 34.1 19.3 20.3 20.7
Other multiple modes S S S S S S S 49.5 S S 34.0 S
Other and unknown modes 38.6 14.2 35.0 21.3 22.7 36.4 31.3 42.6 56.6 19.5 36.1 26.3

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 21.3 14.5 31.1 S 15.0 S 34.9 18.5 62.6 20.4 25.3 74.7
Single modes 21.7 15.7 33.0 S 15.2 S 35.0 18.7 63.5 S 22.0 S
Truck 20.9 16.8 32.3 45.6 16.0 115.5 32.0 19.4 61.5 S 22.1 S
Rail S 42.9 S S 39.1 S S 36.0 S 31.6 25.2 17.3
Water
Air (including truck and air) S S S S S S S S S 31.6 36.1 37.4
Pipeline S S S S S S
Multiple modes S S S S S S S S S 26.1 21.7 27.8
Parcel, USPS or courier S S S S S S S S S 26.1 21.7 27.8
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S 30.6 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 28.2 11.6 62.8 26.5 8.9 39.4 19.8 20.8 46.3 28.6 40.6 45.7
Single modes 28.3 11.6 63.2 26.6 9.0 39.7 19.9 20.8 46.5 21.7 S S
Truck 29.2 11.6 64.3 29.9 9.0 41.8 20.9 20.3 38.5 19.8 S S
Rail S S S S S S S S S 31.6 S S
Water
Air (including truck and air) S S 47.0 S S 28.7
Pipeline S S S S S S
Multiple modes S S S S S S S S S 30.1 27.9 26.5
Parcel, USPS or courier S S S S S S S S S 30.1 27.9 26.5
Truck and rail
Other multiple modes
Other and unknown modes 44.9 S S S S S S S S 29.4 26.4 61.2

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 S 25.3 S 22.0 22.4 21.2 25.4 18.1 21.4 22.1 43.3 74.6
Single modes S 25.6 S 22.1 22.4 21.1 26.1 18.2 21.6 25.6 44.4 71.1
Truck S 26.5 S 23.1 21.9 21.6 26.4 19.5 29.6 25.6 47.5 79.7
Rail 32.6 33.2 19.2 S 43.9 S 33.8 28.8 10.2 S S S
Water
Air (including truck and air) S S S S S S 31.6
Pipeline S S S S S S
Multiple modes S S S S S S S S S 35.8 S S
Parcel, USPS or courier S S S S S S S S S 31.6 31.6 66.9
Truck and rail S S S S S S S S S 31.6 29.6 66.6
Other multiple modes
Other and unknown modes S S S S 47.6 S S S S S S S

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 46.2 18.8 62.4 44.4 21.0 69.9 S 13.9 S S 16.0 S
Single modes 46.2 18.9 62.6 44.4 21.0 69.9 S 13.9 S S 14.9 S
Truck 48.3 18.9 63.6 S 21.3 S 35.2 13.7 38.2 S 15.1 S
Rail S 38.3 S S 41.7 S S 43.1 S 31.6 33.3 37.0
Water
Air (including truck and air) S S S S S S 31.6
Pipeline S S S S S S
Multiple modes S S S S S S S S S 30.4 S S
Parcel, USPS or courier S S S S S S S S S 30.4 S S
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S

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 9.0 7.7 16.9 20.0 10.2 31.5 17.4 11.1 34.7 12.3 11.8 23.3
Single modes 9.0 7.1 16.5 20.6 10.0 32.1 18.0 11.2 35.2 17.1 11.7 24.0
Truck 10.3 8.4 19.3 25.6 11.2 38.9 18.4 14.6 40.1 18.9 10.2 25.8
Rail 13.1 26.5 45.0 12.8 29.7 47.2 27.0 24.5 56.9 26.3 17.8 18.1
Water S S S S S S S S S 31.6 31.6 2.3
Air (including truck and air) S 33.5 S S S S S S S 20.7 9.1 27.1
Pipeline S S S S S S S S S S
Multiple modes 18.9 15.5 36.6 31.9 23.6 38.0 S 26.7 S 7.3 10.8 18.6
Parcel, USPS or courier 22.0 17.0 37.2 20.3 26.5 24.0 24.4 37.0 31.4 7.1 10.8 18.2
Truck and rail S S S S S S 42.4 S S 26.5 27.9 20.9
Other multiple modes S S S S S S S S S 29.8 45.0 S
Other and unknown modes 36.4 50.0 44.1 37.7 42.0 89.5 36.9 S S S 32.6 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 21.5 10.0 34.0 26.8 9.3 36.5 32.4 5.6 48.2 6.2 6.0 9.3
Single modes 23.2 9.8 36.0 27.4 9.4 36.9 32.5 5.8 48.2 7.8 10.4 16.0
Truck 22.5 10.1 35.3 26.8 11.2 38.7 32.5 8.8 52.2 6.9 10.7 14.7
Rail 45.7 9.8 58.9 34.5 10.0 37.0 36.6 8.4 46.9 7.4 10.4 16.3
Water S S S S S S S S S 31.6 31.6 4.6
Air (including truck and air) S 39.6 S 40.2 35.4 170.5 46.2 40.7 210.7 10.9 14.1 20.0
Pipeline S S S S S S
Multiple modes 24.4 20.6 46.9 41.4 22.3 69.8 28.1 25.4 31.6 6.5 6.4 9.3
Parcel, USPS or courier 27.5 21.6 50.8 30.7 15.1 37.5 24.6 22.2 37.5 6.5 6.4 9.3
Truck and rail S 31.4 S S 36.2 S S 32.4 S 26.4 25.3 26.8
Other multiple modes S S S S S S S S S S 30.0 S
Other and unknown modes S 30.3 S 44.6 26.3 120.4 S 30.4 S S 19.7 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 11.0 6.5 12.7 29.9 17.0 55.2 13.6 15.2 29.4 15.2 11.2 24.8
Single modes 12.3 6.9 14.3 30.2 17.3 56.5 13.6 14.2 29.6 25.0 13.2 29.3
Truck 12.6 3.6 14.0 32.2 18.8 61.2 14.5 6.0 25.4 25.0 13.6 29.8
Rail 25.4 S S 26.1 27.0 54.9 24.6 38.7 56.5 15.9 11.7 20.8
Water S S S S S S 31.6
Air (including truck and air) S 32.2 S 44.6 45.2 7.5 44.7 36.1 8.7 7.7 15.4 22.5
Pipeline S S S S S S
Multiple modes 44.1 16.1 41.8 26.0 13.1 15.8 30.4 19.0 19.9 9.1 11.8 23.9
Parcel, USPS or courier 44.1 16.3 42.4 26.0 10.1 22.7 30.4 17.5 39.4 9.1 11.8 23.9
Truck and rail 35.2 35.9 38.3 23.1
Other multiple modes S S S S S S S S S 31.6 30.5 47.1
Other and unknown modes S 29.4 S 47.1 S S S S S 28.1 39.9 22.7

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 14.3 10.8 26.4 13.7 10.0 28.3 12.5 9.9 27.9 15.7 7.7 26.3
Single modes 15.9 13.7 32.7 14.1 11.7 31.6 12.3 10.4 29.7 26.7 19.2 76.0
Truck 15.2 13.4 30.2 14.5 11.8 33.5 12.4 9.0 28.5 26.5 18.4 80.0
Rail 43.0 S S 41.7 S S 36.7 S S 26.1 29.6 62.9
Water S S S S S S S S
Air (including truck and air) 37.8 31.1 40.9 S S S S S S 8.1 6.5 9.7
Pipeline S S S S S S
Multiple modes 32.7 21.3 44.5 36.4 23.2 67.6 35.8 39.4 58.2 7.9 12.3 18.3
Parcel, USPS or courier 34.4 23.0 51.8 16.0 21.5 22.4 16.0 17.8 27.1 7.9 12.3 18.3
Truck and rail S 43.9 S S 41.7 S S S S 25.8 29.6 18.6
Other multiple modes S S S S S S S S S 31.6 31.1 488.7
Other and unknown modes 36.1 24.3 30.1 39.8 43.5 38.2 S S S S S 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 31.3 39.8 81.2 38.3 15.0 143.8 26.2 17.1 53.0 29.6 11.9 15.4
Single modes 32.2 44.8 96.0 38.4 16.1 148.7 26.3 19.5 58.3 20.7 17.7 9.6
Truck 32.4 45.4 98.4 38.3 19.1 166.5 23.9 23.1 61.5 19.8 18.0 10.1
Rail S S S S S S S S S 28.3 28.1 63.4
Water
Air (including truck and air) S 27.9 S S 44.6 S S 38.0 S 21.9 18.2 21.5
Pipeline S S S S S S
Multiple modes 25.4 27.9 15.9 34.9 30.0 22.4 33.1 16.1 19.1 9.9 19.2 32.6
Parcel, USPS or courier 25.4 27.9 15.9 34.9 30.0 22.4 33.1 16.1 19.1 9.9 19.2 32.6
Truck and rail
Other multiple modes
Other and unknown modes 48.8 27.7 18.5 43.8 S S S S S 48.9 39.6 5.0

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 47.4 27.1 15.9 44.1 S S S 34.6 S 24.3 22.3 27.4
Single modes 46.5 37.5 19.9 44.3 S S S 39.6 S 41.3 S S
Truck 46.5 38.2 20.4 44.3 S S S 39.7 S 41.3 S S
Rail
Water
Air (including truck and air) S S S S S S 25.8
Pipeline S S S S S S
Multiple modes S S S S S S S S S 25.9 17.4 29.7
Parcel, USPS or courier S S S S S S S S S 25.9 17.4 29.7
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S 29.8 26.7 0.2

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.