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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 6.2 13.2 11.8 6.3 16.6 9.4 4.2 11.4 9.9 2.9 9.7
Single modes 7.1 6.6 14.5 12.2 6.5 17.1 9.6 5.0 12.6 20.3 11.8 25.5
Truck 7.8 7.3 16.1 12.7 8.5 20.0 10.7 6.0 17.9 18.0 14.2 23.3
Rail 19.6 12.2 27.2 S 15.4 S 21.2 13.1 21.5 14.4 10.3 43.5
Water 43.2 41.2 19.1 S S S S S S S S S
Air (including truck and air) 21.6 19.9 49.6 38.1 S S 41.5 S S 5.2 10.9 20.8
Pipeline 49.5 S S S S S S S S S S S
Multiple modes 9.7 4.0 11.6 16.9 20.8 9.7 10.7 21.7 7.7 3.7 3.2 5.3
Parcel, USPS or courier 9.8 3.9 11.8 12.1 7.4 18.1 15.4 7.7 25.3 3.7 3.3 5.3
Truck and rail 27.7 15.6 14.7 38.2 28.5 11.5 29.8 17.9 14.6 22.2 19.6 45.5
Other multiple modes S 41.5 S S 30.2 S S 31.1 S 24.3 27.2 27.1
Other and unknown modes 35.4 14.5 46.1 19.4 13.0 76.6 24.3 21.9 45.5 39.6 18.2 21.1

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 15.6 10.5 19.8 22.0 17.3 19.1 37.2 44.3 42.8 18.4 21.5 37.4
Single modes 16.6 10.4 20.9 22.8 17.5 19.5 38.1 45.2 43.8 22.2 31.3 86.9
Truck 16.1 10.7 21.2 22.4 9.6 20.0 40.0 14.0 56.4 22.7 31.8 86.7
Rail S S S S S S S S S 23.4 22.1 31.2
Water S S S S S S S S S 31.6 31.5 461.2
Air (including truck and air) S S S S S S S S S 22.8 7.1 23.3
Pipeline – – – – – – S S S S S S
Multiple modes S 24.8 S S S S S 47.5 S S 11.6 S
Parcel, USPS or courier S 29.9 S S 46.2 S S 48.3 S 29.6 11.6 28.7
Truck and rail S S S S S S S S S 31.6 39.8 141.4
Other multiple modes S – S S – S S – S 32.2 – –
Other and unknown modes S 35.7 S S 23.6 S S 46.7 S S 37.9 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 8.3 3.4 12.3 9.7 5.5 11.8 23.6 12.1 39.2 S 30.1 S
Single modes 9.1 4.3 13.9 10.4 7.4 14.2 24.6 11.5 50.7 S 11.9 S
Truck 9.3 4.1 13.7 10.8 7.1 14.2 19.8 10.3 41.0 S 11.3 S
Rail S 42.5 S S 38.5 S S 44.8 S 16.2 12.4 33.9
Water S – S S – S S – S 31.6 – –
Air (including truck and air) S S S S S S S S S 29.8 27.2 55.0
Pipeline S – S S – S S S S S S S
Multiple modes 41.6 35.1 34.1 27.2 44.5 1.8 46.2 46.9 4.2 21.9 11.8 25.5
Parcel, USPS or courier 47.6 24.2 129.4 49.9 24.1 106.2 42.9 37.5 64.8 18.9 11.8 22.8
Truck and rail 41.3 S S 45.2 S S S S S 24.1 31.3 116.9
Other multiple modes S 45.0 S S 45.1 S S 47.8 S S S S
Other and unknown modes S S S S S S S 46.3 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 14.6 17.5 18.3 15.7 15.8 26.0 20.0 23.3 20.7 33.8 15.9 29.1
Single modes 14.6 18.9 19.5 15.9 16.0 25.9 19.9 26.9 25.1 34.8 15.7 31.1
Truck 15.4 25.5 27.6 16.6 18.8 35.5 24.1 22.3 45.2 35.9 15.4 37.3
Rail 14.4 28.2 17.5 25.6 37.7 14.3 24.5 49.6 12.5 46.4 32.3 80.9
Water – – – – – – – – – – – –
Air (including truck and air) – S S – S S – S S – 25.1 –
Pipeline – – – – – – S S S S S S
Multiple modes S S S S S S S S S 28.9 S S
Parcel, USPS or courier S S S S S S S S S 29.0 S S
Truck and rail S S S S S S S S S 28.1 31.6 S
Other multiple modes – S S – S S – S S – 29.8 –
Other and unknown modes 42.7 S S 43.7 S S S S S 31.3 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 13.3 10.8 21.8 13.4 10.3 17.6 14.1 24.3 19.5 24.6 12.6 16.7
Single modes 13.2 10.7 21.7 13.4 10.3 17.5 14.1 24.3 19.5 24.9 10.8 17.4
Truck 13.6 10.7 21.3 13.4 10.3 16.7 14.0 24.3 19.2 24.9 10.8 17.4
Rail – – – – – – – – – – – –
Water – – – – – – – – – – – –
Air (including truck and air) – – – – – – – – – – – –
Pipeline 49.6 S S S S S S S S S S S
Multiple modes S 32.8 S S S S S S S S 24.7 S
Parcel, USPS or courier S 38.5 S S 45.7 S S S S 32.2 25.9 27.3
Truck and rail – S S – S S – S S – 31.6 –
Other multiple modes S – S S – S S – S 31.6 – –
Other and unknown modes S 49.2 S S S S S S S 32.3 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 9.2 5.1 15.7 S 13.1 S 15.2 5.9 17.2 8.3 5.6 8.9
Single modes 10.6 4.7 16.6 S 13.3 S 15.3 6.4 17.7 39.5 31.8 77.7
Truck 11.9 5.5 19.8 S 9.8 S 11.8 7.5 19.6 41.8 36.0 82.8
Rail 28.6 14.8 34.4 S 18.0 S 22.7 7.5 22.7 13.7 15.1 17.6
Water S S S S S S S S S 39.3 29.9 924.9
Air (including truck and air) S 44.6 S S 29.7 S S 37.3 S 13.7 S S
Pipeline S S S S S S S S S S S S
Multiple modes 20.6 12.3 30.7 S 46.6 S 25.2 31.2 27.1 4.4 4.5 5.9
Parcel, USPS or courier 20.7 12.5 31.1 19.2 9.8 28.2 19.6 11.4 26.3 4.4 4.5 5.9
Truck and rail S S S S S S S S S 31.1 34.3 60.2
Other multiple modes S – S S – S S – S 28.0 – –
Other and unknown modes S 21.3 S 23.1 20.2 20.3 S 19.8 S S 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 9.9 6.5 15.4 S 34.0 S 15.8 20.1 44.3 11.0 7.6 20.1
Single modes 7.9 8.9 15.6 S 36.0 S 17.6 23.0 52.1 24.7 18.7 52.0
Truck 8.7 8.9 16.2 S 38.5 S 22.1 27.0 69.8 31.7 19.6 58.9
Rail 29.8 22.7 42.9 36.2 23.3 44.8 35.6 26.4 51.5 14.6 16.5 43.3
Water S S S S S S S S S S 29.8 S
Air (including truck and air) S S S 46.1 S S 46.0 S S 7.4 6.7 10.5
Pipeline – – – – – – S S S S S S
Multiple modes 33.7 12.3 45.8 27.8 40.2 20.3 33.1 28.6 28.3 4.0 7.5 12.7
Parcel, USPS or courier 34.2 12.5 47.4 36.4 19.7 64.0 42.5 22.2 102.0 4.0 7.5 12.7
Truck and rail 38.4 30.8 20.6 45.4 S S S 36.0 S 26.9 19.3 36.0
Other multiple modes S S S S S S S S S 31.6 31.6 28.4
Other and unknown modes 24.5 21.5 42.1 31.5 34.0 298.3 45.1 45.7 339.6 S 14.1 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 10.9 8.7 13.5 24.9 11.4 25.7 16.9 12.7 21.1 21.8 12.7 31.3
Single modes 11.8 10.2 15.7 25.6 11.8 26.4 17.3 14.0 24.0 17.2 8.9 18.8
Truck 11.0 9.8 14.7 26.3 11.9 26.9 18.5 9.6 25.2 16.8 9.0 19.2
Rail 37.1 26.7 46.8 S 34.4 S 42.0 46.2 40.0 20.8 32.5 30.2
Water S S S S 47.0 S S S S S S S
Air (including truck and air) 46.2 29.3 113.9 28.1 S S 28.6 S S 6.3 8.9 14.1
Pipeline S S S S S S S S S S S S
Multiple modes 15.5 13.1 17.4 41.0 20.9 43.7 30.9 17.7 31.4 10.4 13.6 23.8
Parcel, USPS or courier 15.5 13.5 17.7 19.8 13.7 15.7 23.4 18.6 22.8 10.4 13.6 23.7
Truck and rail 47.8 S S S 39.2 S S 37.3 S 25.8 43.9 36.0
Other multiple modes S S S S S S S S S 29.8 S S
Other and unknown modes 17.6 19.1 16.8 39.5 20.8 47.3 29.1 31.2 4.5 S 19.7 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 17.6 8.0 33.5 26.1 11.4 80.4 14.2 6.2 55.1 15.7 9.5 18.6
Single modes 23.0 11.9 56.4 27.6 13.6 95.6 16.7 9.4 76.1 31.4 24.3 63.9
Truck 25.7 13.8 67.1 28.4 13.8 98.1 18.1 8.0 80.0 39.4 35.1 84.6
Rail S S S S S S S S S S 26.7 S
Water S S S S S S S S S S S S
Air (including truck and air) 24.2 23.8 56.9 48.7 35.8 284.9 38.0 48.1 242.6 6.1 18.4 41.4
Pipeline – – – – – – S S S S S S
Multiple modes 14.0 8.3 18.3 16.3 12.3 25.8 20.7 13.4 42.4 6.6 7.7 10.6
Parcel, USPS or courier 13.8 8.3 17.7 16.6 12.3 25.8 21.5 13.0 43.2 6.7 7.7 10.6
Truck and rail S S S S S S S S S 31.6 31.6 44.6
Other multiple modes S S S S S S S S S 29.4 29.6 25.8
Other and unknown modes 38.3 17.8 32.6 31.9 15.3 57.0 44.9 21.7 182.5 S 45.1 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 8.4 30.0 47.7 18.4 20.8 34.0 31.1 20.4 49.2 13.0 9.9 8.4
Single modes 8.9 32.9 56.4 18.9 21.2 34.8 33.6 21.7 53.7 33.6 23.1 17.2
Truck 8.7 33.2 57.4 13.7 22.3 30.8 16.3 17.8 22.8 31.8 26.3 16.1
Rail S 35.5 S S 39.2 S S S S 24.8 24.2 44.5
Water S S S S S S S S S 31.6 49.4 550.4
Air (including truck and air) 42.0 45.2 44.6 S S S S S S 10.2 7.4 14.5
Pipeline S – S S – S S S S S S S
Multiple modes 20.0 13.8 21.0 31.7 29.6 45.8 40.4 30.0 57.5 10.8 5.6 8.7
Parcel, USPS or courier 20.4 14.0 21.7 40.1 15.4 61.5 S 15.8 S 10.7 5.6 8.7
Truck and rail S 33.2 S 42.1 42.0 13.5 48.1 45.3 18.8 27.1 20.9 61.3
Other multiple modes S S S S S S S S S 38.1 28.1 12.9
Other and unknown modes 41.0 40.2 48.7 S 34.7 S 45.1 S S S 27.7 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 21.7 30.5 15.9 49.4 35.9 74.5 32.5 28.2 21.3 S 32.0 S
Single modes 23.8 36.7 19.0 49.6 36.6 76.0 32.8 29.8 22.5 S 28.1 S
Truck 25.8 37.4 18.6 S 39.6 S 35.7 31.1 24.2 S 30.6 S
Rail S S S S S S S S S 31.6 31.6 2.1
Water – – – – – – – – – – – –
Air (including truck and air) S S S S S S S S S 26.9 27.0 69.2
Pipeline – – – – – – S S S S S S
Multiple modes S 36.0 S 32.8 38.3 48.4 42.8 24.9 89.4 20.1 49.8 117.7
Parcel, USPS or courier S 36.0 S 32.8 38.3 48.4 42.8 24.9 89.4 20.1 49.8 117.7
Truck and rail – – – – – – – – – – – –
Other multiple modes – – – – – – – – – – – –
Other and unknown modes S S S S 44.0 S S S S S 37.6 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.
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