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 9.5 6.1 15.0 10.5 12.5 14.2 5.7 9.8 13.8 15.4 5.2 25.2
Single modes 10.6 6.2 15.8 10.1 12.8 13.8 7.0 10.3 14.2 14.3 5.5 28.3
Truck 11.0 6.3 17.2 12.6 14.0 15.4 9.4 6.2 14.3 14.5 5.8 29.0
Rail 13.5 35.7 21.8 15.6 29.5 30.8 14.0 17.3 18.6 12.8 16.0 23.0
Water S 40.8 S 38.2 32.8 74.9 34.3 33.6 62.2 20.4 43.0 94.2
Air (including truck and air) S 39.4 S 37.2 29.8 97.0 32.0 41.7 78.1 5.3 5.3 9.9
Pipeline S S S S S S S S S S S S
Multiple modes 23.5 6.7 48.1 28.8 42.1 117.8 34.4 28.4 175.2 20.1 6.5 18.3
Parcel, USPS or courier 32.8 9.4 58.0 33.5 8.6 88.1 32.5 11.1 81.8 20.2 6.6 18.3
Truck and rail 21.7 25.0 113.1 26.1 18.4 175.3 25.7 17.1 116.3 10.1 6.9 10.9
Other multiple modes S S S S S S S S S S S S
Other and unknown modes 33.4 26.8 71.9 S 25.8 S S 27.3 S 38.4 31.4 102.2

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 22.4 4.8 23.9 27.7 15.9 14.1 24.4 16.2 26.2 39.6 26.4 108.6
Single modes 22.6 5.2 24.6 27.9 16.1 14.5 24.4 16.4 27.0 26.3 24.0 99.4
Truck 22.8 5.6 25.8 28.1 17.5 15.2 21.5 18.6 30.1 26.8 23.9 100.2
Rail S 28.1 S S 36.2 S S 25.8 S 32.0 23.0 57.0
Water S S S S S S S S S 29.8 26.1 42.3
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 31.0 S S
Parcel, USPS or courier S S S S S S S S S 31.0 32.1 88.3
Truck and rail S S S S S S 28.8
Other multiple modes
Other and unknown modes S 31.0 S S S S S 30.7 S S 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 26.3 36.4 26.8 29.1 34.3 30.8 30.1 18.8 28.6 16.0 23.1 72.0
Single modes 27.3 36.8 23.6 31.9 34.9 30.6 38.9 18.4 27.2 23.1 22.6 47.9
Truck 27.0 41.4 26.5 32.5 42.0 40.1 42.0 20.1 44.9 23.9 22.6 49.2
Rail S 27.6 S 49.5 26.9 5.6 46.7 25.5 7.0 25.9 10.8 33.2
Water S S S S S S 29.8
Air (including truck and air)
Pipeline S S S S S S
Multiple modes 39.5 47.0 S 43.7 S S 48.2 S S S S S
Parcel, USPS or courier S S S S S S S S S 43.2 31.2 56.5
Truck and rail 43.6 S S 48.2 S S 49.1 S S 19.1 25.7 38.3
Other multiple modes
Other and unknown modes S 36.4 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 47.7 16.7 55.2 20.7 34.8 37.0 15.6 19.8 38.8 S S S
Single modes 48.7 17.7 57.8 20.9 35.5 38.1 15.9 21.3 42.4 S S S
Truck S 19.0 S 28.8 40.1 37.8 27.9 28.7 34.2 29.8 S S
Rail 34.0 27.8 53.3 20.8 37.8 64.8 18.6 30.4 49.1 15.2 S S
Water 42.0 41.4 42.7 26.1
Air (including truck and air) S S S S S S 30.6
Pipeline S S S S S S
Multiple modes 43.2 S S 40.0 S S 48.5 S S 46.5 23.1 13.9
Parcel, USPS or courier S 41.7 S S 38.8 S S 38.7 S 31.6 24.5 13.4
Truck and rail 48.6 S S 48.6 S S 48.6 S S 25.8 31.6 19.1
Other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S S S S 33.3 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 39.2 17.3 33.1 42.8 17.1 26.7 S 15.7 S 21.1 13.3 71.5
Single modes 35.5 17.2 20.9 47.2 17.0 21.0 S 15.7 S 26.7 15.7 63.9
Truck 35.5 17.9 21.6 47.2 17.3 21.3 S 18.8 S 21.4 15.8 51.9
Rail S S 49.6 S S 26.7
Water S S S S S S 41.5
Air (including truck and air) S S S S S S S S S 27.9 31.1 31.1
Pipeline S S S S S S
Multiple modes S S S S S S S S S S S S
Parcel, USPS or courier S S S S S S S S S S S S
Truck and rail
Other multiple modes S S S S S S 29.9
Other and unknown modes S 44.9 S S 49.4 S S S S 30.8 18.0 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 8.7 8.9 11.2 16.8 11.5 15.9 14.9 18.0 22.8 38.1 17.7 31.5
Single modes 9.4 9.2 11.6 15.7 13.0 15.9 14.4 17.8 20.3 34.7 13.6 42.9
Truck 11.0 8.9 12.7 14.7 10.2 13.9 10.4 15.0 15.4 34.8 14.1 43.4
Rail 28.4 19.7 23.6 22.3 35.7 43.1 22.4 28.7 39.5 11.7 15.4 20.3
Water S S S S S S S S S 29.9 S S
Air (including truck and air) S 32.2 S S 16.0 S S 19.4 S 16.4 8.5 18.8
Pipeline S S S S S S S S S S S S
Multiple modes 26.2 20.6 43.8 32.1 46.4 142.2 27.7 45.1 104.5 S 14.1 S
Parcel, USPS or courier S 23.0 S S 26.7 S S 21.1 S S 14.4 S
Truck and rail 20.5 39.3 133.7 23.7 39.0 193.9 22.4 40.5 136.3 19.9 22.7 24.4
Other multiple modes S S S S S S S S S S 31.6 S
Other and unknown modes 32.4 15.9 21.1 32.8 S S 29.4 S S S 24.2 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 35.8 4.9 48.4 35.0 8.9 50.9 23.8 8.0 28.4 13.1 7.7 16.5
Single modes 31.6 5.0 39.2 36.6 8.8 51.9 25.1 8.0 28.7 14.4 8.9 28.6
Truck 33.0 4.8 42.7 43.0 9.0 60.8 31.2 7.6 40.8 11.9 9.5 23.2
Rail 23.8 17.5 25.5 49.7 14.7 71.2 23.4 15.3 22.1 21.7 4.9 13.7
Water S S S S S S 31.6
Air (including truck and air) S 26.2 S S S S S S S 23.0 19.2 50.7
Pipeline S S S S S S
Multiple modes S 24.7 S 49.8 21.2 540.5 42.7 33.8 296.3 19.2 6.2 15.2
Parcel, USPS or courier S 24.6 S S 21.4 S S 24.1 S 19.3 6.2 15.2
Truck and rail S 42.4 S S 39.7 S S 46.4 S 30.9 22.5 24.9
Other multiple modes S S S S S S S S S 31.6 31.6 24.1
Other and unknown modes S 28.2 S S 38.7 S 49.3 49.5 260.9 S 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 7.6 18.9 20.3 17.0 37.6 31.1 15.9 29.9 40.6 23.1 14.7 22.6
Single modes 7.1 20.6 20.6 18.3 38.4 30.6 14.9 30.9 37.1 27.1 21.8 30.4
Truck 7.4 8.1 12.4 27.1 18.2 28.5 26.2 14.5 40.5 28.2 23.2 31.7
Rail 28.1 S S 23.9 S S 21.3 41.4 39.8 16.1 S S
Water S S S S S S S S S 30.4 27.9 32.9
Air (including truck and air) 47.4 S S 49.1 S S S S S 20.1 5.3 26.1
Pipeline S S S S S S
Multiple modes 38.4 22.2 53.9 S 37.3 S S 42.3 S 10.4 5.5 11.4
Parcel, USPS or courier 25.3 22.9 28.2 26.2 18.2 19.4 19.3 21.1 17.8 11.8 5.5 13.1
Truck and rail S S S S S S S S S 26.9 26.3 36.4
Other multiple modes S S S S S S S S S S 28.2 S
Other and unknown modes 31.6 30.1 143.4 S 34.9 S S 29.1 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 34.6 7.8 100.3 48.0 12.6 154.5 S 14.0 S 13.0 24.2 64.2
Single modes 36.5 8.5 113.6 49.2 13.6 160.9 S 14.5 S 22.0 29.5 114.4
Truck 41.9 9.7 123.6 S 13.7 S S 14.5 S 21.2 20.5 119.9
Rail S S S 42.1 S S 46.6 S S 27.3 31.6 186.4
Water S S S S S S 30.7
Air (including truck and air) S 24.8 S S 24.8 S S 24.1 S 14.0 7.6 19.7
Pipeline S S S S S S
Multiple modes 37.7 22.8 62.2 35.4 14.4 134.4 41.0 17.7 259.3 4.9 12.6 20.0
Parcel, USPS or courier 37.8 22.8 61.6 35.8 14.4 127.6 41.9 17.7 245.3 4.8 12.6 20.0
Truck and rail S S S S S S 28.3
Other multiple modes S S S S S S 31.6
Other and unknown modes 28.8 47.8 96.9 27.2 43.5 101.3 41.3 30.1 388.2 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 15.2 29.9 86.1 12.6 34.5 61.7 18.8 25.0 47.7 13.6 10.1 16.2
Single modes 16.4 27.9 91.0 12.6 31.0 66.8 19.2 23.4 53.5 15.1 14.1 21.1
Truck 16.5 28.4 94.4 14.8 36.6 89.5 20.4 20.8 62.6 16.2 14.2 21.6
Rail S 30.2 S S 35.5 S S 35.7 S 28.4 24.3 22.7
Water S S S S S S S S S 26.1 28.6 35.1
Air (including truck and air) S 43.8 S S 34.2 S S 31.3 S 17.8 13.2 22.1
Pipeline S S S S S S
Multiple modes S 12.6 S 38.1 S S 47.9 S S 15.7 8.1 19.0
Parcel, USPS or courier S 10.2 S 38.4 15.4 23.4 49.1 18.9 33.1 15.8 8.1 19.1
Truck and rail S S S S S S S S S 31.6 31.6 14.8
Other multiple modes S S S S S S S S S 47.6 31.6 159.5
Other and unknown modes S S S S S S S S 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 42.0 S S S S S 39.0 S S 29.9 30.6 115.1
Single modes 37.1 S S S S S S S S S 38.3 S
Truck 39.6 S S S S S S S S S 39.4 S
Rail S S S S S S S S S 29.8 31.3 35.6
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 29.9 26.6 70.0
Parcel, USPS or courier S S S S S S S S S 30.0 26.6 70.3
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 30.6 182.9

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.