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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 9.5 10.3 18.5 15.2 19.3 35.9 21.5 22.1 47.0 20.3 S S
Single modes 6.1 11.9 17.2 12.7 20.1 37.0 16.0 23.9 45.7 14.7 43.1 57.9
Truck 5.5 24.0 33.2 11.3 24.2 38.9 15.9 14.1 28.2 11.9 35.8 47.6
Rail 11.4 8.1 15.4 14.1 21.9 40.4 16.3 24.3 46.5 2.7 4.5 5.0
Water – – – – – – – – – – – –
Air (including truck and air) 45.8 S S S S S S S S 13.2 26.0 46.2
Pipeline S S S 38.5 S S S S S S S S
Multiple modes 45.4 26.0 86.5 S 27.2 S S 26.6 S 12.2 S S
Parcel, USPS or courier S 32.1 S 28.8 S S 34.2 33.2 58.4 12.3 S S
Truck and rail 34.5 43.4 35.1 S S S S S S 21.5 23.8 32.2
Other multiple modes S 21.7 S S 27.7 S S 27.0 S 28.0 12.7 36.0
Other and unknown modes 22.7 37.2 44.2 S S S 35.9 S S 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 43.2 34.9 114.7 48.7 S S 48.0 43.2 50.6 S S S
Single modes 46.0 41.7 146.6 49.0 S S 48.0 37.5 78.8 S S S
Truck S S S S S S 48.8 S S S 41.1 S
Rail S 33.4 S S S S 49.7 39.7 73.8 25.4 31.9 91.6
Water – – – – – – – – – – – –
Air (including truck and air) – – – – – – – – – – – –
Pipeline – – – – – – S S S S S S
Multiple modes S – S S – S S – S 31.6 – –
Parcel, USPS or courier S – S S – S S – S 31.6 – –
Truck and rail – – – – – – – – – – – –
Other multiple modes – – – – – – – – – – – –
Other and unknown modes S S S S S S S S S 31.8 31.6 0.5

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 19.4 31.1 40.4 19.2 37.2 40.3 25.7 25.5 19.0 S S S
Single modes 19.5 31.1 40.3 19.2 37.2 40.2 25.6 25.5 18.9 S S S
Truck 21.3 35.9 52.5 21.6 44.5 58.9 34.7 40.9 35.6 S S S
Rail 44.2 34.5 19.4 43.4 32.3 16.9 45.4 32.5 20.3 21.2 18.5 32.6
Water – – – – – – – – – – – –
Air (including truck and air) – – – – – – – – – – – –
Pipeline – – – – – – S S S S S S
Multiple modes S S S S S S S S S 31.6 31.6 100.5
Parcel, USPS or courier S S S S S S S S S 31.6 31.6 100.5
Truck and rail – – – – – – – – – – – –
Other multiple modes – – – – – – – – – – – –
Other and unknown modes S – S S – S S – S 31.6 – –

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 40.5 28.5 41.4 39.6 22.1 60.1 46.3 22.1 61.1 40.0 43.2 52.8
Single modes 41.0 28.4 41.4 40.9 22.1 60.0 46.5 22.1 60.9 38.8 42.9 52.1
Truck 32.7 38.5 50.2 34.7 S S S 21.0 S S S S
Rail S 29.8 S S 18.4 S S 23.3 S 5.2 5.5 6.3
Water – – – – – – – – – – – –
Air (including truck and air) – – – – – – – – – – – –
Pipeline S – S S – S S S S S S S
Multiple modes 43.7 S S 37.0 S S 41.0 S S 24.7 29.9 43.6
Parcel, USPS or courier – S S – S S – S S – 29.9 –
Truck and rail 45.3 – – 44.1 – – 47.2 – – 26.7 – –
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 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 11.5 7.9 22.4 16.4 21.1 39.9 22.4 24.0 52.0 28.9 23.0 28.8
Single modes 10.8 7.5 22.2 13.6 22.2 41.8 16.7 26.1 51.4 26.2 23.3 29.6
Truck 15.3 25.0 55.0 24.1 43.5 63.9 25.0 42.1 57.7 27.3 17.3 22.4
Rail 11.6 10.5 23.2 14.5 23.7 44.9 16.8 26.3 51.9 6.8 12.5 17.3
Water – – – – – – – – – – – –
Air (including truck and air) – – – – – – – – – – – –
Pipeline S S S S S S S S S S S S
Multiple modes S 22.3 S S 27.7 S S 27.0 S 31.6 S S
Parcel, USPS or courier S S S S S S S S S 31.6 S S
Truck and rail S S S S S S S S S 31.6 31.6 24.6
Other multiple modes S 22.3 S S 27.7 S S 27.0 S 29.7 15.5 38.5
Other and unknown modes 35.6 41.8 31.4 S S S 38.0 S S 45.5 29.6 39.7

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 25.9 23.5 33.1 32.2 17.3 33.7 33.7 16.0 21.1 30.3 S S
Single modes 26.1 23.1 33.5 32.4 17.4 34.3 34.3 16.1 21.7 31.2 S S
Truck 24.1 33.7 59.8 39.9 27.2 75.4 27.5 24.5 33.8 36.8 S S
Rail 42.5 20.2 24.7 41.8 18.4 23.6 39.4 16.8 21.7 12.7 6.5 13.5
Water – – – – – – – – – – – –
Air (including truck and air) S – S S – S S – S 29.8 – –
Pipeline S S S S S S S S S S S S
Multiple modes 35.2 44.3 48.2 41.0 S S 43.4 S S 23.8 26.3 17.5
Parcel, USPS or courier S S S 26.0 S S 31.3 S S 24.9 27.3 18.3
Truck and rail 42.3 43.8 19.5 42.3 S S 44.0 S S 26.1 25.9 37.8
Other multiple modes – – – – – – – – – – – –
Other and unknown modes 40.2 S S S S S S S 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 27.5 S S 48.4 34.2 67.5 48.0 21.0 70.3 20.7 S S
Single modes 32.2 S S 49.7 36.4 72.6 49.0 21.3 72.0 43.0 S S
Truck 33.6 S S S 43.3 S S 28.6 S 35.7 S S
Rail 33.3 47.1 43.8 16.7 41.3 25.8 16.7 42.4 25.9 4.3 15.4 15.9
Water – – – – – – – – – – – –
Air (including truck and air) S S S S S S S S S 31.6 31.6 56.1
Pipeline – – – – – – S S S S S S
Multiple modes 45.3 36.8 93.4 34.2 S S 38.7 38.0 53.9 14.6 S S
Parcel, USPS or courier 45.3 36.8 93.5 34.2 S S 38.7 38.4 58.8 14.6 S S
Truck and rail – S S – S S – S S – 31.6 –
Other multiple modes – – – – – – – – – – – –
Other and unknown modes 29.2 S S S S S S S S 35.6 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 19.5 30.7 57.8 29.7 37.8 95.9 12.7 30.4 23.1 43.6 47.5 82.6
Single modes 23.4 24.2 55.8 30.1 37.7 95.6 12.8 30.1 22.9 S S S
Truck 23.6 27.5 65.4 33.1 38.0 184.3 17.1 24.1 49.6 39.7 S S
Rail 45.9 32.9 20.0 37.8 38.7 13.0 36.4 34.9 13.8 23.0 19.5 23.6
Water – – – – – – – – – – – –
Air (including truck and air) S S S S S S S S S 26.0 28.4 72.3
Pipeline – – – – – – S S S S S S
Multiple modes 33.6 S S 26.8 S S 34.6 S S 21.9 23.7 27.9
Parcel, USPS or courier 33.6 S S 26.8 S S 34.6 S S 21.9 23.8 28.0
Truck and rail – – – – – – – – – – – –
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 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 S 47.6 S 18.9 45.3 248.4 34.1 S S 23.3 30.4 68.8
Single modes 16.0 S S 23.1 S S 30.9 49.2 771.5 41.1 41.1 137.2
Truck 17.1 S S 23.3 S S 30.2 S S 45.1 40.7 129.0
Rail – – – – – – – – – – – –
Water – – – – – – – – – – – –
Air (including truck and air) 45.3 S S S S S S S S 17.8 31.6 49.7
Pipeline S – S S – S S S S S S S
Multiple modes S S S S S S S S S 20.9 17.1 30.4
Parcel, USPS or courier S S S S S S S S S 20.9 17.1 30.4
Truck and rail – – – – – – – – – – – –
Other multiple modes – – – – – – – – – – – –
Other and unknown modes 48.8 S S 47.1 S S 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 15.9 37.1 55.9 S 41.9 S S 35.5 S 17.8 35.7 56.9
Single modes 19.4 32.6 112.9 S 45.4 S S 44.2 S 47.5 S S
Truck 19.0 32.6 109.5 S 42.8 S S 31.5 S 43.2 S S
Rail – S S – S S – S S – 31.6 –
Water – – – – – – – – – – – –
Air (including truck and air) S – S S – S S – S 26.1 – –
Pipeline – – – – – – S S S S S S
Multiple modes 30.5 S S S 29.5 S S 25.1 S 7.7 19.4 29.2
Parcel, USPS or courier 28.8 S S 34.8 29.5 67.5 37.9 25.1 104.6 7.7 19.4 29.2
Truck and rail S – S S – S S – S 30.2 – –
Other multiple modes – – – – – – – – – – – –
Other and unknown modes S S S S S S S S S S 45.6 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 38.1 S S S S S S S S 46.5 30.0 22.1
Single modes 42.9 S S S S S S S S S 37.5 S
Truck S S S S S S S S S S 37.5 S
Rail S – S S – S S – S 31.8 – –
Water – – – – – – – – – – – –
Air (including truck and air) – – – – – – – – – – – –
Pipeline – – – – – – S S S S S S
Multiple modes S S S S S S 43.3 S S 36.4 30.1 26.4
Parcel, USPS or courier S S S S S S 43.3 S S 36.4 30.1 26.4
Truck and rail – – – – – – – – – – – –
Other multiple modes – – – – – – – – – – – –
Other and unknown modes S – S S – S S – S 31.6 – –

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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