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Table B–7a. Estimated Measures of Reliability for Export Shipment Characteristics by Commodity Group and Export Mode: 2002

[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]

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All Commodities

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 4.9 – 11.8 –
Single modes 4.1 1.3 12.4 1.0
Truck 6.4 1.9 6.5 1.6
Rail 8.9 0.3 16.2 1.9
Water 6.2 1.0 15.9 3.2
Air (including truck and air) 7.5 1.3 11.2 0.2
Pipeline S S S S
Multiple modes 18.2 1.5 14.7 0.9
Parcel, U.S.P.S. or courier 11.0 0.5 31.4 –
Truck and rail – – – –
All other multiple modes 27.7 1.5 15.2 0.9
Other and unknown modes 13.8 0.3 28.6 0.4

SCTG 01-05, Agriculture products and fish

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 14.1 0.9 17.4 3.9
Single modes 13.9 0.9 17.7 3.7
Truck 25.8 0.3 19.1 0.4
Rail 28.9 – 26.4 0.7
Water 16.5 0.8 19.0 3.9
Air (including truck and air) S S S S
Pipeline – – – –
Multiple modes 25.3 – 38.7 0.3
Parcel, U.S.P.S. or courier S S S S
Truck and rail – – – –
All other multiple modes 26.1 – 38.7 0.3
Other and unknown modes 27.5 – 46.7 0.3

SCTG 06-09, Grains, alcohol, and tobacco products

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 18.3 0.3 13.8 0.6
Single modes 19.8 0.3 14.0 0.6
Truck 14.2 – 21.0 0.3
Rail 23.4 – 16.7 0.1
Water 25.4 0.3 16.5 0.3
Air (including truck and air) S S S S
Pipeline S S S S
Multiple modes 32.1 – 23.9 –
Parcel, U.S.P.S. or courier 28.0 – S S
Truck and rail – – – –
All other multiple modes 32.8 – 23.7 –
Other and unknown modes 30.2 – 29.8 –

SCTG 10-14, Stones, nonmetallic minerals, and metallic ores

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 16.9 0.1 23.9 1.9
Single modes 13.8 – 23.9 1.7
Truck 23.6 – 23.5 0.1
Rail 22.6 – 35.3 1.1
Water 18.3 – 31.6 1.1
Air (including truck and air) S S 44.7 –
Pipeline – – – –
Multiple modes S S 39.8 0.3
Parcel, U.S.P.S. or courier S S S S
Truck and rail – – – –
All other multiple modes S S 39.8 0.3
Other and unknown modes 41.1 – 42.4 –

SCTG 15-19, Coal and petroleum products

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 31.2 0.3 24.2 2.7
Single modes 32.7 0.3 24.4 2.2
Truck 45.2 0.1 S S
Rail 31.7 – 38.5 0.4
Water 37.6 0.3 28.4 2.4
Air (including truck and air) S S S S
Pipeline S S S S
Multiple modes S S S S
Parcel, U.S.P.S. or courier S S S S
Truck and rail – – – –
All other multiple modes S S S S
Other and unknown modes 47.1 – S S

SCTG 20-24, Pharmaceutical and chemical products

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 7.2 0.9 23.2 1.6
Single modes 7.3 0.8 23.9 1.6
Truck 11.6 0.2 16.7 0.3
Rail 28.5 0.2 38.3 0.9
Water 8.2 0.4 40.8 1.8
Air (including truck and air) 11.9 0.4 19.1 –
Pipeline S S S S
Multiple modes 16.0 0.1 18.8 –
Parcel, U.S.P.S. or courier 9.8 – 36.0 –
Truck and rail – – – –
All other multiple modes 18.2 0.1 19.0 –
Other and unknown modes 24.2 – 23.1 –

SCTG 25-30, Logs, wood products, and textile and leather

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 7.3 0.5 11.0 0.8
Single modes 8.1 0.4 10.5 0.4
Truck 8.1 0.2 8.6 0.2
Rail S S 40.6 0.3
Water 15.4 0.4 16.1 0.4
Air (including truck and air) 27.2 – 15.8 –
Pipeline S S S S
Multiple modes 22.5 0.2 37.6 0.5
Parcel, U.S.P.S. or courier 20.7 – 28.2 –
Truck and rail – – – –
All other multiple modes 26.9 0.2 38.0 0.5
Other and unknown modes 20.9 – 15.0 –

SCTG 31-34, Base metal and machinery

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 7.0 1.3 12.4 1.0
Single modes 7.3 1.1 13.2 1.1
Truck 9.9 0.7 10.9 0.4
Rail 25.0 – 21.3 0.1
Water 17.5 0.6 27.7 0.9
Air (including truck and air) 12.2 0.4 17.7 –
Pipeline S S S S
Multiple modes 10.7 0.1 26.4 0.1
Parcel, U.S.P.S. or courier 15.4 0.1 33.5 –
Truck and rail – – – –
All other multiple modes 15.2 0.1 27.4 0.1
Other and unknown modes 31.4 0.3 S S

SCTG 35-38, Electronic, motorized vehicles, and precision instruments

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 8.5 2.2 10.1 0.6
Single modes 7.6 2.4 11.3 0.6
Truck 16.5 1.9 13.3 0.4
Rail 22.2 0.3 13.2 –
Water 12.6 0.6 18.1 0.2
Air (including truck and air) 9.6 1.4 11.4 –
Pipeline S S S S
Multiple modes 32.1 1.6 19.0 –
Parcel, U.S.P.S. or courier 7.5 0.3 15.7 –
Truck and rail – – – –
All other multiple modes S S 22.1 –
Other and unknown modes 36.4 0.3 33.2 –

SCTG 39-43, Furniture, mixed freight and misc. manufactured products

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 8.2 0.6 15.4 0.5
Single modes 9.6 0.4 16.7 0.5
Truck 11.3 0.2 15.7 0.2
Rail 33.2 – 36.0 –
Water 15.7 0.3 21.2 0.4
Air (including truck and air) 17.3 0.2 16.7 –
Pipeline S S S S
Multiple modes 28.7 0.4 29.4 –
Parcel, U.S.P.S. or courier S S 16.3 –
Truck and rail – – – –
All other multiple modes 21.2 0.2 30.2 –
Other and unknown modes 37.7 – 39.1 –

Commodity unknown

Export mode of transportation Value Tons
CV 02 Std. error of percent CV 02 Std. error of percent
All modes 32.1 0.1 S S
Single modes 21.1 – S S
Truck 37.9 – S S
Rail S S S S
Water 44.7 – S S
Air (including truck and air) 41.4 – S S
Pipeline – – – –
Multiple modes S S S S
Parcel, U.S.P.S. or courier S S S S
Truck and rail – – – –
All other multiple modes S S S S
Other and unknown modes S S S S

KEY:
– Represents an estimate 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 on 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: Research and Innovative Technologies Administration, Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Export Data, March 2005.
Research and Innovative Technology Administration (RITA) • U.S. Department of Transportation (US DOT)
1200 New Jersey Avenue, SE • Washington, DC 20590 • 800-853-1351 • E-mail RITA

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