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 5.8 7.1 13.5 14.0 13.0 27.2 11.7 14.5 24.8 16.6 11.2 16.7
Single modes 6.7 6.4 14.7 14.3 13.1 27.6 11.5 16.1 27.5 18.6 8.1 18.8
Truck 6.8 7.0 16.3 14.7 13.1 26.7 15.0 14.6 31.4 19.8 8.8 22.7
Rail 20.0 16.9 35.0 18.3 16.4 40.6 23.6 22.6 39.5 10.7 5.4 9.7
Water S S S S S S S S S 31.6 31.6 504.3
Air (including truck and air) 27.2 18.5 20.7 49.9 36.6 105.4 S 24.0 S 9.0 14.1 28.9
Pipeline S S S S S S S S S S
Multiple modes 19.8 18.9 22.0 11.5 27.1 13.6 16.3 34.5 10.7 9.4 8.2 12.2
Parcel, USPS or courier 20.1 19.7 23.5 19.9 17.8 17.0 20.0 21.3 19.4 9.4 8.3 12.3
Truck and rail 30.7 31.5 12.8 26.4 47.7 16.4 37.9 44.5 8.5 26.4 17.7 24.6
Other multiple modes S S S S S S S S S S 30.1 S
Other and unknown modes 29.6 19.3 73.7 27.1 S S 44.2 S S S 39.2 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 28.3 28.7 67.3 S 36.6 S S S S 18.3 19.2 32.9
Single modes 28.4 28.9 67.4 S 36.7 S S S S 18.7 S S
Truck 28.7 28.8 68.0 S 37.6 S S S S 23.0 S S
Rail 45.3 44.7 45.6 27.1
Water S S S S S S 31.6
Air (including truck and air) S 47.7 S S S S S 48.1 S 29.8 23.3 53.0
Pipeline S S S S S S
Multiple modes S S S S S S S S S 29.7 28.8 48.3
Parcel, USPS or courier S S S S S S S S S 29.7 28.8 48.3
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S S 29.3 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 25.4 14.8 45.1 S 19.0 S S 33.5 S 12.2 21.8 21.1
Single modes 25.2 15.9 46.5 S 19.6 S S 38.6 S 11.7 22.6 22.8
Truck 25.2 16.0 46.7 S 19.7 S S 40.2 S 11.7 22.6 22.9
Rail 42.6 45.2 44.8 26.5
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes S S S S S S S S S S 30.5 S
Parcel, USPS or courier S S S S S S S S S S S S
Truck and rail S S S S S S 31.3
Other multiple modes
Other and unknown modes S S S S 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 43.3 43.1 566.4 43.2 42.5 70.4 36.4 43.0 370.6 S 19.8 S
Single modes 39.8 44.7 501.9 40.8 44.6 68.9 36.7 43.9 379.6 S 21.4 S
Truck S 44.7 S S 44.6 S S 43.9 S S 21.4 S
Rail S S S S S S 28.0
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
Parcel, USPS or courier S S S S S S S S
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S S 30.1 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 19.0 16.7 43.9 20.3 31.0 50.0 24.1 43.4 56.8 9.3 28.4 44.5
Single modes 19.0 16.7 43.9 20.3 31.0 50.0 24.1 43.4 56.9 9.4 28.7 45.2
Truck 18.7 16.2 43.0 19.4 30.1 48.4 22.3 41.0 53.9 9.4 29.0 46.0
Rail S S S S S S S S S 31.6 31.6 35.2
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 30.9 29.2
Parcel, USPS or courier S S S S S S S S S 31.6 31.6 74.7
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 31.6 31.6 140.1

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 20.1 20.4 18.4 48.8 43.3 79.7 29.3 13.7 39.6 44.9 8.8 81.1
Single modes 17.4 20.8 16.2 48.2 44.0 79.4 29.6 11.9 43.7 32.3 17.5 108.1
Truck 17.4 21.6 16.3 26.3 S S 19.7 18.5 41.8 34.6 18.4 119.3
Rail S 41.7 S S 41.3 S S 41.0 S 31.6 25.9 304.6
Water
Air (including truck and air) S 38.4 S S 37.8 S S S S 31.6 24.0 44.3
Pipeline S S S S S S S S S S
Multiple modes 47.1 48.9 19.7 39.9 S S 41.5 S S S 31.3 S
Parcel, USPS or courier 46.6 S S 40.9 33.3 39.9 42.6 33.0 94.1 17.7 31.8 156.7
Truck and rail S S S S S S 31.6
Other multiple modes S S S S S S S S
Other and unknown modes S 43.4 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 9.6 11.4 14.3 22.1 13.4 33.7 15.8 17.5 29.0 9.4 5.9 11.3
Single modes 11.9 9.1 15.0 23.5 13.4 34.2 16.2 17.3 28.6 11.5 7.1 14.5
Truck 12.5 11.1 14.9 32.9 15.5 41.8 21.0 16.4 31.6 12.9 10.3 20.4
Rail 18.8 14.4 33.4 20.0 17.3 42.3 24.7 24.1 42.2 7.1 5.9 7.4
Water S S S S S S 31.6
Air (including truck and air) 38.5 42.2 33.2 32.7 31.8 50.3 40.9 31.9 81.4 29.7 23.7 51.5
Pipeline S S S S S S
Multiple modes 39.9 37.8 38.6 14.8 38.2 26.2 22.6 47.2 19.8 17.5 4.4 18.1
Parcel, USPS or courier 41.7 39.8 41.3 39.4 31.0 28.4 35.2 29.0 26.6 17.6 4.3 18.2
Truck and rail 30.5 32.7 21.5 26.3 47.1 38.2 37.9 S S 25.1 18.2 19.0
Other multiple modes S S S S S S S S
Other and unknown modes S 45.1 S 34.9 48.7 543.7 49.5 38.0 S 20.6 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 19.8 17.8 34.9 S 16.3 S 15.3 44.7 46.7 49.2 22.0 57.3
Single modes 21.6 16.7 44.1 S 17.1 S 20.3 49.3 49.9 S 23.2 S
Truck 21.5 14.3 51.1 S 17.1 S 20.5 49.9 50.2 S 13.1 S
Rail S S S S S S 31.6
Water
Air (including truck and air) 33.7 S S 43.4 S S 49.8 S S 11.0 13.3 17.5
Pipeline S S S S S S
Multiple modes 34.6 33.3 18.7 37.1 35.9 30.1 36.7 38.5 40.7 19.8 12.7 30.8
Parcel, USPS or courier 34.4 33.3 18.6 35.8 35.9 28.7 36.7 38.5 40.7 19.7 12.7 30.8
Truck and rail
Other multiple modes S S S S S S 34.7
Other and unknown modes S 34.4 S S 37.6 S S 43.4 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 15.3 11.6 21.3 27.0 20.7 34.2 33.1 25.4 54.4 S 32.3 S
Single modes 21.1 17.9 28.3 30.8 26.5 44.3 39.1 29.2 59.5 S S S
Truck 28.2 19.7 37.2 32.6 26.9 44.9 46.4 30.0 60.3 S S S
Rail S S S S S S 31.6
Water
Air (including truck and air) 36.4 22.9 32.1 34.4 38.5 100.6 46.9 39.2 233.3 6.3 6.5 11.7
Pipeline S S S S S S
Multiple modes 19.8 16.3 40.2 31.8 S S 45.3 22.9 65.6 21.6 31.1 44.4
Parcel, USPS or courier 19.8 16.3 40.1 31.8 S S 45.5 22.9 65.5 21.6 31.1 44.4
Truck and rail S S S S S S 29.8
Other multiple modes
Other and unknown modes 45.8 38.6 59.2 S 41.1 S S 37.2 S S 44.9 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 19.0 10.2 113.9 15.0 29.4 52.8 22.3 30.1 40.9 17.5 15.7 18.3
Single modes 18.8 11.1 130.9 14.7 29.8 51.8 16.8 32.5 34.8 24.6 21.7 29.7
Truck 18.9 11.2 133.0 14.8 29.6 51.8 17.1 29.7 34.3 26.8 17.3 37.1
Rail S S S S S S 31.4
Water
Air (including truck and air) S S S S S S S S S 26.8 S S
Pipeline S S S S S S
Multiple modes 33.7 30.2 80.8 27.5 34.9 33.2 34.8 41.0 33.9 10.8 10.9 13.8
Parcel, USPS or courier 33.8 30.3 81.8 27.6 33.3 33.8 34.8 41.8 35.1 10.8 10.9 13.8
Truck and rail S S S S S S 31.6
Other multiple modes S S S S S S S S S 31.6 31.6 140.9
Other and unknown modes S 48.8 S 38.0 S S S 47.6 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 36.0 S S S S S S S 39.4 22.4 2.4
Single modes S S S S S S S S S 34.3 26.9 8.0
Truck S S S S S S S S S 38.8 26.9 7.6
Rail
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 S 26.4 S
Parcel, USPS or courier S S S S S S S S S S 28.2 S
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 31.6 30.6 3.1

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.