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 13.3 6.5 23.4 10.4 10.5 12.8 16.3 14.2 29.7 14.8 8.1 29.0
Single modes 13.9 6.6 24.6 10.7 11.0 13.5 16.5 14.0 32.2 17.1 12.4 39.5
Truck 14.6 8.1 27.9 7.8 10.3 11.1 25.3 6.9 52.8 18.4 12.7 40.8
Rail 13.1 15.5 17.9 19.0 28.8 23.4 18.2 31.3 29.2 5.7 7.1 11.2
Water 37.9 42.3 66.0 42.6 S S 47.5 S S 26.1 S S
Air (including truck and air) S 18.5 S S S S 49.5 S S 12.6 2.8 15.1
Pipeline 37.6 44.3 92.2 36.9 44.8 76.9 S S S S S S
Multiple modes 20.9 9.3 43.1 23.0 19.9 47.6 20.3 29.0 48.1 8.3 4.4 11.2
Parcel, USPS or courier 28.1 13.0 60.7 30.3 13.6 49.7 24.9 14.0 45.2 8.6 4.5 11.5
Truck and rail 31.0 26.5 71.6 27.9 27.7 87.3 23.4 33.9 60.8 6.7 9.9 10.5
Other multiple modes S 49.2 S S 42.1 S S 42.8 S 29.1 S S
Other and unknown modes 25.2 20.8 27.8 37.1 39.4 25.6 32.9 S S S 23.1 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 22.9 23.3 50.8 27.7 25.4 57.5 28.8 25.0 81.8 15.3 S S
Single modes 22.9 22.3 51.0 27.8 25.5 58.2 28.8 25.2 82.9 14.7 S S
Truck 23.0 25.3 58.5 28.6 29.7 74.0 28.6 17.7 97.5 15.2 S S
Rail S S S S S S S S S 30.2 24.5 84.0
Water S S S S S S S S S 27.9 S S
Air (including truck and air) S S S S S S 31.6
Pipeline S S S S S S S S S S
Multiple modes S S S S S S S S S 31.7 28.7 178.0
Parcel, USPS or courier S S S S S S S S S 33.9 29.2 53.6
Truck and rail S S S S S S S S S 30.0 31.6 27.5
Other multiple modes S S S S S S 31.6
Other and unknown modes 47.2 S S S S S S S S 34.2 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 24.0 12.2 27.7 24.7 13.8 26.6 29.8 25.5 29.9 22.3 20.9 22.5
Single modes 24.1 11.7 28.0 24.8 13.6 26.6 30.2 25.0 28.1 22.6 20.1 20.2
Truck 24.8 12.7 30.7 26.2 14.7 31.7 31.9 23.4 34.0 22.8 19.4 19.9
Rail S 29.2 S 43.6 29.7 28.3 42.7 30.0 25.7 27.7 26.5 32.7
Water S S S S S S S S
Air (including truck and air)
Pipeline S S S S S S
Multiple modes 41.4 S S 45.1 S S 46.1 S S 40.3 36.4 54.9
Parcel, USPS or courier S S S S S S S S S 31.6 30.3 212.4
Truck and rail 45.3 S S 45.3 S S 46.1 S S 26.2 27.9 36.6
Other multiple modes
Other and unknown modes 49.0 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 17.9 37.0 20.6 32.4 19.6 24.4 19.8 22.8 36.0 S 28.9 S
Single modes 18.6 37.6 20.7 34.1 19.6 24.0 20.5 23.5 35.1 S 29.1 S
Truck 18.4 40.3 19.7 36.1 20.7 25.4 21.5 21.9 31.1 S 29.5 S
Rail 28.3 22.4 75.7 28.5 20.3 46.9 32.7 33.4 72.1 16.0 15.5 23.9
Water
Air (including truck and air)
Pipeline S S S S S S S S S S
Multiple modes 48.1 S S 43.8 S S 41.5 S S 26.2 27.9 33.0
Parcel, USPS or courier S S S S S S S S S 31.6 31.6 36.9
Truck and rail 48.1 S S 43.8 S S 41.5 S S 26.4 29.8 34.6
Other multiple modes
Other and unknown modes S 48.1 S S S S S S S 38.5 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 16.9 23.5 41.0 19.9 25.2 37.3 40.1 35.4 192.8 S 15.5 S
Single modes 17.3 23.6 41.4 20.3 24.8 39.3 40.3 35.7 194.0 S 15.4 S
Truck 19.4 12.5 35.8 21.5 14.3 33.6 S 23.0 S S 15.7 S
Rail 28.8 39.9 97.3 30.1 32.8 65.3 37.1 34.6 83.3 16.4 14.6 24.9
Water 41.9 45.8 63.6 44.6 45.4 62.7 S 48.7 S 43.8 25.8 60.6
Air (including truck and air)
Pipeline 42.3 44.3 96.0 42.0 45.0 84.6 S S S S S S
Multiple modes S S S S S S S S S 31.6 27.1 0.6
Parcel, USPS or courier S S S S S S S S S 31.6 32.3 2.4
Truck and rail S S S S S S 27.9
Other multiple modes
Other and unknown modes S S S S 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 10.7 8.6 20.3 18.3 10.9 39.1 14.1 35.5 40.0 S 16.8 S
Single modes 11.6 9.9 22.2 18.1 10.5 42.5 14.1 21.3 45.7 S 25.3 S
Truck 14.8 7.3 23.8 32.3 10.8 64.8 23.7 18.1 44.7 S 26.9 S
Rail 20.0 31.3 43.5 21.9 20.7 45.9 20.5 31.3 58.9 7.6 7.6 9.4
Water 44.2 S S S S S S S S 28.9 26.1 S
Air (including truck and air) S 25.9 S S S S S S S 28.2 25.4 35.0
Pipeline S S S S S S S S S S S S
Multiple modes 23.8 26.2 138.8 42.9 38.5 368.9 37.6 41.2 100.9 S 35.2 S
Parcel, USPS or courier 28.8 29.0 183.8 26.1 27.9 48.9 42.2 34.0 83.7 25.8 34.3 68.2
Truck and rail 44.3 S S 44.4 48.8 491.6 39.0 S S 28.2 23.5 8.8
Other multiple modes S S S S S S S S S 31.5 31.6 45.6
Other and unknown modes S 34.5 S 41.6 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 34.4 20.2 78.3 12.6 21.7 20.4 16.8 23.9 23.5 15.2 9.3 25.6
Single modes 35.0 20.7 83.9 13.2 22.3 20.9 18.6 24.8 24.8 17.3 12.7 33.8
Truck 36.8 24.5 103.0 14.2 20.9 27.4 15.1 11.7 23.3 17.9 12.9 34.9
Rail 13.9 14.5 17.2 23.5 42.1 28.5 25.0 39.2 32.2 5.0 7.4 9.7
Water S S S S S S S S
Air (including truck and air) 40.1 40.2 81.9 S 44.4 S 47.0 S S 24.1 13.5 76.1
Pipeline S S S S S S
Multiple modes 45.5 20.7 38.6 39.5 16.5 29.3 S 25.2 S 6.0 12.9 17.0
Parcel, USPS or courier S 42.3 S S 38.7 S 47.6 29.7 117.0 7.7 12.4 17.5
Truck and rail 38.5 24.1 17.2 S 24.7 S S 31.5 S 22.5 13.2 26.9
Other multiple modes S S S S S S S S S 31.6 29.8 200.3
Other and unknown modes 39.0 23.3 37.9 S 31.7 S S 29.3 S S 23.4 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 15.5 6.7 18.7 23.4 38.7 7.9 33.2 8.6 31.1 19.8 10.7 32.2
Single modes 12.7 6.4 14.5 23.5 38.9 7.7 32.7 8.7 28.6 32.0 20.7 43.8
Truck 12.6 6.2 14.6 23.2 40.3 8.0 32.0 9.0 31.0 32.3 20.9 45.6
Rail S 44.8 S S 35.5 S S 34.2 S 30.8 31.2 100.6
Water S S S S S S 25.8
Air (including truck and air) S 44.9 S S 42.7 S S 46.0 S 17.6 16.1 19.0
Pipeline S S S S S S
Multiple modes 42.8 17.7 168.7 42.3 27.2 334.8 47.8 30.0 637.4 16.8 9.5 18.7
Parcel, USPS or courier S 17.3 S 34.2 15.2 89.9 43.7 20.9 120.9 19.2 9.6 20.7
Truck and rail S S S S S S S S S 28.1 34.6 77.7
Other multiple modes S S S S S S 31.3
Other and unknown modes 46.6 34.2 34.2 48.5 35.4 29.9 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 43.9 8.5 90.5 43.1 12.2 38.1 11.3 11.3 10.6 21.7 24.6 78.2
Single modes 47.5 9.2 98.6 45.0 12.6 39.6 11.7 12.2 11.1 25.7 36.0 132.6
Truck 47.5 8.8 97.7 45.3 12.7 39.6 11.9 12.3 11.0 30.7 36.1 121.4
Rail S S S S S S S S S 30.0 31.6 488.8
Water S S S S S S 25.8
Air (including truck and air) S 36.3 S S 46.1 S S S S 19.6 7.9 22.2
Pipeline S S S S S S
Multiple modes 37.0 20.5 89.5 49.5 31.9 42.8 41.4 49.5 21.7 14.9 11.6 24.6
Parcel, USPS or courier 36.9 23.4 106.0 S 19.4 S 46.0 21.8 123.5 14.9 11.7 24.8
Truck and rail S 49.2 S S S S S S S 31.6 18.7 33.9
Other multiple modes
Other and unknown modes S 30.6 S S 35.1 S 49.7 40.1 126.5 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 19.3 22.4 48.5 17.2 10.6 26.8 15.3 9.5 21.7 22.1 14.1 25.5
Single modes 19.1 21.7 49.6 16.9 12.7 29.3 15.0 11.2 23.3 26.7 25.9 38.6
Truck 19.1 21.7 49.7 16.9 12.6 30.0 15.0 11.5 24.0 26.9 25.9 38.8
Rail S 38.6 S S S S S 48.2 S 30.0 24.4 73.5
Water S S S S S S 31.6
Air (including truck and air) S S S S S S S S S 31.6 24.4 80.1
Pipeline S S S S S S
Multiple modes 44.0 27.0 38.9 S 43.3 S S 39.8 S 24.9 6.4 27.2
Parcel, USPS or courier S 29.3 S S 24.0 S S 25.0 S 16.1 6.6 18.0
Truck and rail S 49.3 S S S S S S S 28.1 20.2 38.1
Other multiple modes S S S S S S S S S 31.6 29.8 423.6
Other and unknown modes S S S S 48.9 S S 44.5 S 37.9 31.9 57.7

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 39.7 S S 47.2 44.8 8.6 S 33.1 S 35.2 S S
Single modes 42.8 S S 47.6 45.0 8.6 S 33.9 S 32.4 S S
Truck 44.8 S S S 45.5 S S 37.5 S 36.6 S S
Rail S S S S S S S S S 31.6 31.6 6.2
Water
Air (including truck and air) S S S S S S S S S 30.5 31.6 261.2
Pipeline S S S S S S
Multiple modes S S S S S S S S S 37.9 37.0 50.2
Parcel, USPS or courier S 32.7 S S 39.8 S S 38.5 S 37.9 33.5 49.2
Truck and rail S S S S S S 31.6
Other multiple modes
Other and unknown modes S S S S S S S S S 32.4 42.4 17.5

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.