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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

Monday, July 2, 2012

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 15.1 – 25.3 – 11.2 – 9.8
Single modes 17.6 1.8 26.1 2.4 11.7 1.2 20.3
Truck 17.8 1.9 26.3 2.4 11.8 1.4 20.5
Rail 48.4 0.1 S S 38.1 1.4 31.7
All other Single modes 35.3 0.7 35.2 – 26.9 – 17.0
Multiple modes 8.9 1.7 48.3 2.3 15.4 0.8 4.8
Parcel, USPS or courier 8.8 1.7 14.6 0.3 19.0 0.8 4.8
All other multiple modes S S S S S S S
Other and unknown modes 30.6 0.5 29.8 0.3 22.6 0.6 37.4

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 41.0 – S S S S 28.2
Single modes 42.4 7.4 S S S S S
Truck 42.4 7.2 S S S S 33.5
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 31.3
Parcel, USPS or courier S S S S S S 31.3
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 42.2

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 22.8 – 26.2 – 28.2 – S
Single modes 22.9 0.1 26.2 – 28.3 0.5 S
Truck 22.9 0.1 26.2 – 28.3 0.5 S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 28.1
Parcel, USPS or courier S S S S S S 28.1
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 S S 23.1 – 24.4 – 25.3
Single modes 47.8 2.5 22.8 0.4 24.2 0.3 20.7
Truck 47.8 2.5 22.8 0.4 24.2 0.3 20.7
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 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 S S 47.4 – S S S
Single modes S S 47.4 10.5 S S S
Truck S S 47.4 10.5 S S S
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 S S 27.3 – 22.0 – 20.2
Single modes S S 28.1 2.0 24.5 4.5 S
Truck S S 29.6 3.2 17.8 5.2 S
Rail S S S S S S 28.4
All other Single modes S S S S S S 25.5
Multiple modes 43.7 4.7 21.0 1.8 35.4 4.4 8.9
Parcel, USPS or courier 43.8 4.6 17.9 1.0 23.5 2.0 8.9
All other multiple modes S S S S S S 28.9
Other and unknown modes 35.4 0.8 34.2 0.4 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 15.3 – 13.9 – 21.8 – 11.8
Single modes 17.1 7.2 14.3 1.9 22.4 2.3 43.3
Truck 17.1 7.2 14.4 2.2 22.8 3.5 32.5
Rail S S S S S S 29.9
All other Single modes 49.6 – 45.5 – S S 27.9
Multiple modes 23.1 7.1 27.2 1.7 28.3 2.1 9.2
Parcel, USPS or courier 23.1 7.1 27.2 1.7 28.4 2.1 9.2
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 48.1 0.5 38.9 0.5 41.4

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 16.6 – S S 24.5 – 18.8
Single modes 18.3 2.2 S S 25.5 2.5 26.3
Truck 18.1 1.9 S S 25.5 2.5 28.4
Rail S S S S S S 31.6
All other Single modes 42.7 0.5 36.3 – 33.6 – 22.2
Multiple modes 15.0 2.2 S S 39.8 1.6 13.6
Parcel, USPS or courier 15.8 2.3 36.3 0.9 45.4 1.6 13.6
All other multiple modes S S S S S S 31.6
Other and unknown modes 41.0 1.0 37.8 1.7 35.6 1.9 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 13.0 – 28.9 – 35.5 – 20.9
Single modes 16.9 6.1 29.7 4.1 41.4 6.3 47.2
Truck 22.1 5.3 29.9 4.1 42.7 6.9 S
Rail – – – – – – –
All other Single modes 46.1 5.9 S S 43.4 1.1 15.0
Multiple modes 16.1 6.2 42.4 4.1 36.5 5.5 15.1
Parcel, USPS or courier 16.1 6.2 42.4 4.1 36.5 5.5 15.1
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 16.5 – 29.8 – 18.5 – 19.7
Single modes 18.1 6.8 30.4 3.2 19.4 7.7 44.7
Truck 18.2 6.8 30.4 3.2 19.5 7.7 43.1
Rail – – – – – – –
All other Single modes S S S S S S 18.7
Multiple modes 18.8 7.0 30.6 3.3 32.6 7.9 14.3
Parcel, USPS or courier 18.8 7.0 30.6 3.3 32.6 7.9 14.3
All other multiple modes – – – – – – –
Other and unknown modes 42.6 0.9 38.2 0.4 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 S S S S S S 26.5
Single modes 45.2 14.1 S S S S 32.0
Truck S S S S S S 22.4
Rail S S S S S S 31.6
All other Single modes S S S S S S 30.3
Multiple modes S S S S S S 28.4
Parcel, USPS or courier S S S S S S 28.4
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.