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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 10.4 – 21.7 – 13.1 – 11.0
Single modes 11.3 1.9 21.0 0.9 13.5 0.6 8.9
Truck 12.5 2.3 21.7 1.3 15.4 3.5 9.7
Rail 32.1 1.4 33.6 1.2 31.7 3.4 16.0
All other Single modes S S S S S S 6.3
Multiple modes 16.9 1.8 13.6 – 15.5 0.4 10.3
Parcel, USPS or courier 17.2 1.8 14.2 – 13.8 0.2 10.3
All other multiple modes 40.8 – 28.2 – 29.3 0.3 13.0
Other and unknown modes 29.4 0.6 S S 34.9 0.4 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 31.9 – 22.5 – 27.6 – 17.3
Single modes 32.0 1.1 22.1 0.8 28.2 1.7 35.7
Truck 32.1 1.0 21.6 2.0 26.1 3.2 35.8
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 20.2
Parcel, USPS or courier S S S S S S 16.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 32.9

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 18.6 – 20.6 – 19.2 – 47.8
Single modes 18.7 0.9 20.6 0.2 19.2 0.2 29.7
Truck 18.7 0.9 20.7 0.5 19.2 0.2 29.7
Rail S S S S S S 37.1
All other Single modes – – – – – – –
Multiple modes 42.6 0.9 44.1 0.2 43.4 0.2 24.8
Parcel, USPS or courier 43.9 0.8 41.5 – 43.3 0.2 24.8
All other multiple modes S S S S S S 31.6
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 29.1 – 35.9 – 32.0 – 36.6
Single modes 27.6 1.1 33.7 1.5 31.2 1.0 36.0
Truck 28.4 2.1 34.5 2.4 33.0 9.1 36.5
Rail S S S S S S 31.6
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
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 33.7 – 48.8 – S S 25.0
Single modes 33.7 – 48.8 – S S 25.1
Truck 33.7 – 48.8 – S S 25.1
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 29.8

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 16.2 – 25.8 – 29.8 – 11.1
Single modes 16.9 3.7 26.6 1.5 30.8 1.8 14.1
Truck 17.4 3.4 28.4 3.0 37.8 7.5 14.1
Rail 42.6 0.7 43.5 2.8 45.1 7.6 25.2
All other Single modes S S S S S S 30.0
Multiple modes 25.7 2.1 35.3 1.1 38.9 1.4 12.6
Parcel, USPS or courier 25.3 2.1 33.2 0.9 25.0 0.8 12.6
All other multiple modes S S S S S S 27.5
Other and unknown modes S S 44.6 0.7 S S 26.6

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 15.4 – 12.4 – 11.5 – 11.5
Single modes 16.3 1.5 13.2 1.4 11.8 1.1 9.5
Truck 17.8 4.2 15.1 3.6 10.6 5.3 12.4
Rail 46.1 1.6 41.5 3.3 46.9 4.7 12.4
All other Single modes S S S S S S 30.5
Multiple modes 15.1 1.4 11.0 0.3 27.1 0.9 11.7
Parcel, USPS or courier 15.3 1.4 14.7 0.3 19.0 0.4 11.7
All other multiple modes 47.8 0.2 S S S S 29.3
Other and unknown modes 21.4 0.3 31.3 1.3 32.3 0.4 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 20.5 – 27.8 – 42.7 – 9.9
Single modes 21.8 4.3 28.3 0.8 43.9 1.2 14.3
Truck 22.0 4.9 28.7 1.3 45.3 4.4 15.4
Rail S S S S S S 36.4
All other Single modes 37.5 0.6 35.7 – 34.8 0.1 39.1
Multiple modes 36.6 4.1 45.0 0.6 S S 13.7
Parcel, USPS or courier 37.8 4.1 41.8 0.4 40.6 0.3 13.6
All other multiple modes S S S S S S 29.8
Other and unknown modes S S 45.6 0.4 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 17.5 – 26.4 – 26.8 – 11.7
Single modes 21.0 4.2 27.4 2.0 28.8 3.9 18.1
Truck 24.4 7.9 32.2 9.4 36.1 9.2 17.5
Rail 40.6 6.0 49.4 8.5 47.1 8.8 25.3
All other Single modes S S 26.8 0.2 42.0 0.5 5.4
Multiple modes 33.5 4.5 32.4 1.8 24.8 3.3 10.2
Parcel, USPS or courier 33.6 4.5 33.3 1.5 29.6 2.3 10.1
All other multiple modes S S S S S S 30.4
Other and unknown modes 46.9 2.1 48.8 1.6 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 21.0 – 24.3 – 13.0 – 10.9
Single modes 23.8 2.7 21.7 1.8 14.8 2.9 20.5
Truck 24.5 3.4 23.4 3.3 11.6 5.3 20.4
Rail S S S S S S 28.3
All other Single modes S S S S S S 26.0
Multiple modes 18.0 2.7 17.9 0.6 27.2 2.4 9.1
Parcel, USPS or courier 18.0 2.7 17.9 0.6 27.2 2.4 9.1
All other multiple modes S S S S S S 31.6
Other and unknown modes 34.1 0.6 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 43.2 – 35.2 – 35.9 – 32.3
Single modes 45.9 3.2 35.5 0.7 36.0 0.4 30.9
Truck 45.9 3.2 35.5 0.7 36.0 0.4 30.9
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes 45.3 3.2 S S S S 26.1
Parcel, USPS or courier S S 44.7 – 43.5 0.3 27.2
All other multiple modes S S S S S S 31.6
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.