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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 10.8 – 14.9 – 16.7 – 24.6
Single modes 11.6 2.7 15.0 – 16.6 0.3 29.8
Truck 12.3 3.2 15.3 2.3 15.9 3.3 18.8
Rail S S S S S S S
All other Single modes 26.4 1.2 29.1 – 35.9 0.2 5.2
Multiple modes 20.3 2.5 25.0 – 42.9 0.3 13.5
Parcel, USPS or courier 20.5 2.6 26.9 – 42.9 0.2 13.6
All other multiple modes S S S S S S S
Other and unknown modes 24.6 0.4 26.6 – 49.5 0.2 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 S S S S S S 27.7
Single modes S S S S S S 35.6
Truck S S S S S S 35.6
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 S S S S S S 31.6

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 32.7 – 38.0 – 46.5 – 36.0
Single modes 32.7 0.1 38.1 – 46.5 – 30.6
Truck 32.7 0.1 38.1 – 46.5 – 30.6
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 31.8
Parcel, USPS or courier S S S S S S 31.8
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 31.6

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 15.3 – 21.4 – 31.0 – 31.8
Single modes 15.5 1.5 21.5 – 31.0 0.1 31.8
Truck 16.3 5.3 22.1 3.9 18.7 11.2 19.3
Rail S S S S S S 30.1
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 29.8

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 17.6 – 19.5 – 22.1 – 11.8
Single modes 17.7 0.1 19.5 0.2 22.1 0.2 12.0
Truck 17.7 0.1 19.5 0.2 22.1 0.2 12.0
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 33.9

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 30.2 – 41.2 – 39.9 – S
Single modes 30.0 2.4 41.2 4.5 40.1 1.4 S
Truck 30.2 10.2 39.6 10.1 37.4 10.0 S
Rail S S S S S S 31.6
All other Single modes S S S S S S 26.0
Multiple modes S S S S S S 20.6
Parcel, USPS or courier S S S S S S 20.6
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S S

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 14.5 – 19.0 – 32.2 – 21.8
Single modes 13.4 6.3 20.4 3.7 34.6 6.7 35.1
Truck 13.5 6.5 20.5 3.8 36.2 7.2 32.4
Rail S S S S S S 31.6
All other Single modes 48.5 0.5 S S S S 21.0
Multiple modes 31.0 4.9 23.4 1.1 47.0 3.3 16.8
Parcel, USPS or courier 31.3 4.9 25.3 1.0 46.5 3.0 16.8
All other multiple modes S S S S S S 35.8
Other and unknown modes 38.0 2.2 49.0 2.9 47.8 4.6 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 15.7 – 47.6 – 38.6 – S
Single modes 15.3 4.6 48.5 1.8 39.2 1.2 S
Truck 15.8 4.8 48.6 1.9 39.4 1.5 S
Rail – – – – – – –
All other Single modes S S S S S S 30.7
Multiple modes 48.2 4.3 S S 24.7 0.8 15.1
Parcel, USPS or courier S S 46.8 0.4 25.5 0.8 15.8
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 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 35.5 – 26.0 – 42.3 – S
Single modes 41.9 10.0 26.9 3.6 41.9 7.5 S
Truck 48.7 10.1 27.0 9.0 42.4 11.3 S
Rail – – – – – – –
All other Single modes 28.7 6.3 45.2 6.2 42.1 7.9 25.2
Multiple modes 25.6 9.8 44.5 2.5 S S 19.3
Parcel, USPS or courier 25.6 9.8 44.5 2.5 S S 19.3
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 10.3 – 14.6 – 38.0 – 21.7
Single modes 12.1 6.6 14.8 0.6 39.0 3.3 19.4
Truck 12.2 6.5 14.8 1.0 38.3 3.2 21.4
Rail S S S S S S 30.0
All other Single modes 49.2 0.3 S S S S 26.4
Multiple modes 33.1 6.6 35.8 0.5 27.8 3.3 14.4
Parcel, USPS or courier 33.1 6.6 35.8 0.5 27.8 3.3 14.4
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 29.6

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 42.1 – S S 37.4 – S
Single modes 44.1 14.5 S S 37.5 14.9 S
Truck 44.1 14.5 S S 37.5 14.9 S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 43.2
Parcel, USPS or courier S S S S S S 43.2
All other multiple modes – – – – – – –
Other and unknown modes – – – – – – –

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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