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Table B–6. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for CBSA of Origin: 2002

[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 CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 3.0 – 9.0 – 21.0 – 15.9
Single modes 4.4 2.7 9.3 2.2 21.2 3.0 30.7
Truck 4.8 3.0 9.7 5.9 9.9 8.4 30.5
Rail 14.0 0.6 25.1 6.6 35.1 8.7 12.9
All other Single modes 49.1 0.5 S S S S 6.9
Multiple modes 19.5 2.4 S S 49.5 2.9 11.2
Parcel, USPS or courier 20.0 2.4 S S S S 11.3
All other multiple modes 34.4 – S S S S 22.6
Other and unknown modes 32.0 0.7 S S S S 28.4

SCTG 01-05, Agriculture products and fish

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes S S S S S S 29.8
Single modes S S S S S S 29.8
Truck S S S S S S 29.8
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes – – – – – – –

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

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 30.1 – 38.6 – 46.3 – S
Single modes 30.1 1.5 38.6 1.3 46.3 7.6 S
Truck 30.1 1.5 38.6 1.3 46.3 7.6 S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.8
Parcel, USPS or courier S S S S S S 29.8
All other multiple modes – – – – – – –
Other and unknown modes – – – – – – –

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

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes S S 16.4 – 36.8 – 23.9
Single modes S S 16.8 1.4 36.9 0.2 23.9
Truck S S 16.7 2.7 37.4 1.6 24.0
Rail S S S S S S 29.8
All other Single modes S S S S S S S
Multiple modes S S S S S S 29.2
Parcel, USPS or courier S S S S S S 29.2
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S S

SCTG 15-19, Coal and petroleum products

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 15.1 – 24.8 – 37.9 – 23.3
Single modes 13.6 3.2 26.2 6.8 38.2 4.7 27.9
Truck 28.7 8.1 28.9 11.9 24.6 13.1 31.6
Rail 24.9 9.4 29.6 13.4 39.0 14.3 14.5
All other Single modes S S S S S S 30.1
Multiple modes S S S S S S 25.4
Parcel, USPS or courier S S S S S S 30.4
All other multiple modes S S S S S S 27.9
Other and unknown modes S S S S S S 31.0

SCTG 20-24, Pharmaceutical and chemical products

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 24.7 – 34.6 – 30.4 – 12.7
Single modes 23.3 7.3 34.2 0.6 29.7 2.6 14.8
Truck 24.8 7.4 23.6 5.6 22.2 4.8 14.9
Rail S S S S S S 39.5
All other Single modes S S S S S S 25.0
Multiple modes S S 25.1 0.7 33.4 2.9 37.3
Parcel, USPS or courier S S 48.3 0.1 S S 17.3
All other multiple modes 40.0 0.7 36.6 0.7 42.1 3.0 25.0
Other and unknown modes S S S S S S 38.6

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

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 31.9 – 22.3 – 28.6 – 18.9
Single modes 27.1 9.4 24.9 5.4 22.4 10.2 23.2
Truck 24.9 9.5 24.7 5.3 22.0 10.1 24.3
Rail S S S S S S 31.6
All other Single modes S S S S S S 25.0
Multiple modes S S S S S S 14.8
Parcel, USPS or courier S S S S S S 14.8
All other multiple modes – – – – – – –
Other and unknown modes 34.8 0.8 29.8 0.5 S S S

SCTG 31-34, Base metal and machinery

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 9.2 – 21.0 – 10.1 – 21.3
Single modes 8.8 1.1 21.8 2.1 10.4 0.9 26.6
Truck 9.9 1.6 24.2 4.1 13.9 5.1 27.0
Rail 17.0 1.4 20.7 2.8 18.2 3.4 21.1
All other Single modes 41.7 0.2 S S S S 20.0
Multiple modes 40.8 1.2 27.7 – 42.8 0.2 20.6
Parcel, USPS or courier 41.7 1.3 23.6 – 26.3 – 20.4
All other multiple modes S S S S S S 29.2
Other and unknown modes 30.9 0.8 S S S S S

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

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 18.8 – S S 37.7 – 22.9
Single modes 25.2 5.7 S S 38.1 6.8 S
Truck 26.4 5.5 S S 42.0 9.5 S
Rail S S S S S S 39.6
All other Single modes 30.9 0.8 46.4 0.5 S S 12.2
Multiple modes 21.9 5.6 22.3 2.2 23.3 2.2 19.1
Parcel, USPS or courier 21.9 5.6 22.3 2.2 23.3 2.2 19.1
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S S

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

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 15.7 – 43.5 – S S 24.3
Single modes 14.2 3.9 44.6 2.4 S S 29.7
Truck 12.9 3.9 31.9 10.3 S S 30.0
Rail S S S S S S 45.6
All other Single modes S S S S S S 30.9
Multiple modes 42.9 2.8 28.1 0.2 38.2 1.8 12.5
Parcel, USPS or courier 42.9 2.8 28.1 0.2 38.2 1.8 12.5
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S S

Commodity Unknown

Mode of transportation Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All modes 34.6 – S S S S S
Single modes 34.7 10.5 S S S S S
Truck 35.9 10.6 S S S S S
Rail S S S S S S 31.6
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 31.6
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 31.6

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, Metropolitan Data, December 2004.
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