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 8.7 17.1 23.1 22.1 33.4 51.4 10.0 10.1 14.1 17.6 26.7 76.3
Single modes 7.7 18.5 22.9 22.6 33.9 51.8 10.8 9.7 13.7 24.4 26.2 43.3
Truck 8.5 15.8 20.9 16.5 14.3 29.9 7.0 11.3 11.8 18.0 27.6 30.8
Rail S 33.4 S 28.1 41.3 44.2 37.2 35.0 48.6 38.1 20.9 47.6
Water 44.1 S S S S S 49.0 S S 26.6 31.6 S
Air (including truck and air) 37.9 36.9 66.4 48.3 41.2 77.5 S S S 8.8 20.4 27.5
Pipeline 48.6 S S 48.5 S S S S S S S S
Multiple modes 24.1 40.1 91.4 28.4 48.4 128.2 44.2 48.7 101.8 11.9 24.1 33.2
Parcel, USPS or courier 25.2 26.1 102.8 31.3 26.9 276.0 25.7 24.0 108.3 12.7 25.1 35.4
Truck and rail S S S S S S S S S 26.3 25.9 53.7
Other multiple modes S S S S S S S S
Other and unknown modes 31.0 37.8 27.0 S 34.5 S S 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 21.1 23.0 34.0 22.7 22.9 27.7 17.8 18.2 33.6 26.0 40.4 112.2
Single modes 21.6 23.2 34.8 22.9 23.1 28.0 18.1 18.2 33.8 32.3 41.4 101.4
Truck 21.2 23.2 34.1 25.8 24.3 29.1 15.1 18.1 31.6 32.6 41.8 103.3
Rail S S S S S S S S S 28.1 26.8 35.1
Water S S S S S S S S S 28.0 31.6 S
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 34.6 S S 41.3 S 31.1 26.0 141.2

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 8.4 25.5 27.9 20.6 22.9 44.3 33.0 23.9 91.4 27.7 S S
Single modes 8.6 26.3 29.1 20.8 23.4 45.3 33.0 25.4 104.7 31.5 S S
Truck 8.5 26.3 28.7 21.3 23.4 44.5 33.0 25.4 84.5 32.6 S S
Rail S S S S S S 29.8
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes S S S S S S S S S 28.6 47.7 42.9
Parcel, USPS or courier S S S S S S S S S 28.6 31.6 33.0
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

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 42.3 S S 43.2 49.8 103.0 32.3 44.1 35.3 17.4 S S
Single modes 42.2 S S 43.1 49.8 102.7 32.2 44.1 35.2 17.3 S S
Truck 42.2 S S 43.1 49.8 102.7 32.2 44.1 35.2 17.3 S S
Rail
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes
Parcel, USPS or courier
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S 31.6

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 33.1 S S 30.5 S S 29.5 S S 28.3 31.3 7.2
Single modes 33.1 S S 30.5 S S 29.6 S S 42.2 30.2 17.0
Truck 29.1 40.4 75.3 27.3 40.1 144.4 26.2 39.2 119.8 34.7 32.1 15.5
Rail S S S S S S 45.7 S S 26.9 31.6 54.1
Water 33.3
Air (including truck and air) S S S S S S 31.6
Pipeline 48.9 S S 48.9 S S S S S S S S
Multiple modes S S S S S S S S S 27.5 31.6 5.5
Parcel, USPS or courier S S S S S S S S S 27.5 31.6 5.5
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S 31.5

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 22.1 45.2 65.3 24.1 34.7 35.5 26.2 17.1 27.2 25.1 16.7 24.2
Single modes 22.5 46.1 61.7 26.0 35.0 35.0 28.9 18.5 28.0 23.9 26.7 36.6
Truck 24.2 S S 24.1 41.3 35.8 16.8 18.5 22.4 24.0 28.2 29.4
Rail S 35.6 S 41.1 40.9 54.3 S 33.5 S 48.1 36.4 45.2
Water S S S S S S 31.6
Air (including truck and air) 36.6 S S S S S S S S 11.3 26.4 33.0
Pipeline S S S S S S S S S S
Multiple modes 38.5 36.9 182.5 S S S S S S 40.5 24.9 43.3
Parcel, USPS or courier 39.9 28.3 208.5 35.6 42.6 52.2 22.9 41.3 33.4 41.1 25.2 43.6
Truck and rail S S S S S S S S S 31.6 29.8 128.2
Other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S S 36.8 S 29.2 24.8 7.8

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 26.9 24.9 24.8 25.4 23.1 25.1 S 26.0 S 15.9 17.7 43.3
Single modes 31.0 27.0 22.4 26.2 23.2 25.1 S 26.2 S 27.9 30.4 33.6
Truck 31.0 27.0 22.4 26.2 23.2 25.1 S 26.2 S 28.2 29.5 33.4
Rail S S S S S S S S
Water
Air (including truck and air) S S S S S S S S S 27.3 30.9 33.3
Pipeline S S S S S S
Multiple modes 32.6 S S 39.3 S S 35.8 S S 15.0 19.7 23.0
Parcel, USPS or courier 32.6 S S 39.3 S S 35.8 S S 15.0 19.7 23.0
Truck and rail
Other multiple modes
Other and unknown modes 45.9 S S S 48.4 S S S S 30.9 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 10.9 27.1 29.9 S S S 30.6 39.3 70.1 20.9 32.9 34.3
Single modes 9.7 27.7 27.2 S S S 30.8 39.5 70.2 32.1 S S
Truck 9.1 27.7 26.5 S S S 17.8 39.5 39.1 20.6 S S
Rail S S S S S S 27.9
Water
Air (including truck and air) 46.4 S S 41.3 S S 43.2 S S 22.7 32.9 65.3
Pipeline S S S S S S
Multiple modes 28.8 S S 30.8 S S 36.1 S S 17.6 27.9 25.9
Parcel, USPS or courier 28.8 S S 30.8 S S 36.1 S S 17.6 27.9 25.9
Truck and rail
Other multiple modes
Other and unknown modes 40.2 S S S S S S S S 37.2 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 26.1 38.9 57.1 17.7 36.0 52.6 37.1 S S 17.2 S S
Single modes 18.1 34.1 52.4 17.1 30.8 55.8 23.0 32.6 68.6 S S S
Truck 18.8 37.9 60.0 17.1 30.9 56.1 23.2 34.7 75.6 26.8 S S
Rail
Water
Air (including truck and air) 44.0 43.8 48.7 S S S S S S 16.7 23.4 29.6
Pipeline S S S S S S
Multiple modes 41.6 S S 49.7 S S S S S 10.4 36.0 59.1
Parcel, USPS or courier 33.7 35.7 59.9 41.6 48.3 90.1 48.1 43.5 159.9 13.2 42.0 77.7
Truck and rail S S S S S S S S S 27.9 29.8 59.1
Other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 44.8 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 28.1 42.1 109.4 21.2 38.7 40.6 26.5 41.7 32.5 16.7 21.9 17.3
Single modes 28.8 43.3 93.6 22.9 38.8 35.0 26.1 41.9 24.8 19.5 32.7 18.5
Truck 29.0 43.5 94.2 22.8 38.8 35.0 25.8 41.9 24.5 29.9 42.7 21.0
Rail S S S S S S 31.6
Water
Air (including truck and air) S S S S S S S 49.8 S 24.3 33.2 59.8
Pipeline S S S S S S
Multiple modes 33.1 32.0 518.2 26.8 31.5 S 36.0 33.2 S 44.4 24.1 28.1
Parcel, USPS or courier 35.0 32.0 444.3 38.6 31.5 S 32.6 33.2 453.5 44.6 24.1 28.0
Truck and rail 46.8 47.7 S S 26.4
Other multiple modes
Other and unknown modes 31.6 S S S S S S S S S 47.2 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 44.7 S S 37.1 S S S S S S 42.7 S
Single modes S S S 37.9 S S S S S S 31.4 S
Truck S S S 37.9 S S S S S S 31.4 S
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 43.2 29.8 34.0
Parcel, USPS or courier S S S S S S S S S 43.2 29.8 34.0
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S 34.6 S 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.