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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 7.5 – 23.0 – 12.8 – 25.9
Single modes 4.9 3.1 23.5 0.7 13.5 1.0 S
Truck 6.2 3.2 23.3 6.3 19.4 5.0 35.6
Rail 25.1 2.0 S S 18.7 4.9 10.9
All other Single modes 29.5 1.4 37.2 – S S 14.9
Multiple modes 16.5 1.6 24.3 – 24.4 0.6 6.9
Parcel, USPS or courier 16.6 1.6 31.9 – 36.5 0.6 6.9
All other multiple modes 35.6 – 42.1 – 42.0 0.1 26.5
Other and unknown modes S S 27.2 0.7 44.6 0.8 S

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 19.6 – 24.6 – S S 24.9
Single modes 19.8 3.4 24.9 0.9 S S S
Truck 20.1 3.3 25.1 1.0 S S S
Rail 46.3 0.8 S S S S 27.0
All other Single modes – – – – – – –
Multiple modes S S S S S S 30.6
Parcel, USPS or courier S S S S S S 30.6
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 36.0

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 20.0 – 21.5 – 32.0 – S
Single modes 23.4 6.1 24.9 6.7 33.6 3.2 S
Truck 22.7 6.1 25.2 5.7 28.6 5.6 S
Rail S S S S S S 15.4
All other Single modes S S S S S S 31.6
Multiple modes 47.6 3.1 S S S S 18.8
Parcel, USPS or courier 47.6 3.1 S S S S 18.8
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S S

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 11.6 – 20.9 – 28.0 – 18.8
Single modes 11.6 0.2 20.9 – 28.0 0.5 18.5
Truck 14.1 5.3 22.4 3.6 36.5 8.9 17.4
Rail 15.6 5.3 31.7 3.6 16.7 8.7 30.2
All other Single modes – – – – – – –
Multiple modes S S S S S S 28.1
Parcel, USPS or courier – – – – – – –
All other multiple modes S S S S S S 28.1
Other and unknown modes – – – – – – –

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 35.8 – 46.1 – 46.8 – 37.0
Single modes 35.8 – 46.1 – 46.8 – 37.0
Truck 35.8 – 46.1 – 46.8 – 37.0
Rail – – – – – – –
All other Single modes – – – – – – –
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 – – – – – – –

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 27.2 – S S 21.3 – 47.8
Single modes 26.4 11.4 S S 21.4 0.6 S
Truck 25.9 8.1 S S 21.5 2.5 S
Rail 33.9 7.7 S S 22.7 2.9 16.8
All other Single modes S S S S S S 30.1
Multiple modes S S S S S S 32.3
Parcel, USPS or courier S S S S S S 28.4
All other multiple modes S S S S S S 31.2
Other and unknown modes S S 35.9 – 39.5 – 37.4

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 24.0 – S S 27.4 – 15.3
Single modes 17.0 5.2 S S 28.7 1.8 46.4
Truck 18.9 5.9 S S 33.6 6.2 45.5
Rail 22.3 1.9 21.5 3.7 22.6 6.2 14.5
All other Single modes S S S S S S 19.3
Multiple modes S S S S S S 7.8
Parcel, USPS or courier S S S S S S 7.7
All other multiple modes S S S S S S 28.9
Other and unknown modes S S 36.8 5.9 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 9.3 – 46.0 – 29.0 – S
Single modes 10.4 3.0 46.1 0.6 29.8 2.4 S
Truck 9.2 4.4 46.3 2.1 31.7 6.4 S
Rail S S S S S S 31.6
All other Single modes S S S S S S 31.2
Multiple modes 30.4 3.1 46.6 0.3 S S 12.9
Parcel, USPS or courier 30.4 3.1 45.5 0.3 S S 12.8
All other multiple modes S S S S S S 31.6
Other and unknown modes 38.5 0.8 S S 40.8 – 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 8.5 – 25.6 – 25.4 – S
Single modes 9.1 5.8 27.0 8.3 29.1 8.9 S
Truck 22.2 8.7 29.8 9.5 35.9 9.5 S
Rail S S S S S S 28.8
All other Single modes 33.2 6.4 S S S S 23.4
Multiple modes 24.6 6.3 S S S S 8.9
Parcel, USPS or courier 24.6 6.3 S S S S 8.9
All other multiple modes – – – – – – –
Other and unknown modes 41.9 1.4 44.7 3.7 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 10.6 – 24.2 – 24.1 – 16.3
Single modes 9.4 3.7 24.7 1.2 25.6 4.6 S
Truck 9.4 3.7 24.7 1.2 25.9 5.1 S
Rail S S S S S S S
All other Single modes S S 47.4 – S S 18.7
Multiple modes 46.8 3.7 S S S S 11.2
Parcel, USPS or courier 47.2 3.7 S S S S 11.2
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S 38.2 0.8 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 33.3 – S S S S S
Single modes 32.1 10.2 S S S S 39.0
Truck 38.1 12.6 S S S S 40.6
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 37.5
Parcel, USPS or courier S S S S S S 37.5
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 35.5

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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