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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 14.2 – 10.5 – 15.2 – 19.5
Single modes 13.2 3.4 10.6 0.4 15.5 1.2 S
Truck 16.5 6.2 16.1 10.7 18.2 7.8 48.7
Rail 27.8 4.3 35.0 12.1 24.3 9.7 12.8
All other Single modes S S S S S S 21.6
Multiple modes 35.7 3.6 49.1 0.4 37.2 1.2 12.7
Parcel, USPS or courier 39.0 2.9 S S S S 12.7
All other multiple modes S S S S 46.0 1.1 25.2
Other and unknown modes 32.9 1.4 36.2 0.3 S S 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 32.5 – 35.5 – S S 27.5
Single modes 32.8 1.0 35.9 1.1 S S 27.6
Truck 32.8 1.0 35.9 1.1 S S 27.6
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 31.6
Parcel, USPS or courier – – – – – – –
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 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 S S S S S S S
Single modes S S S S S S S
Truck S S S S S S S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 30.7
Parcel, USPS or courier S S S S S S 30.7
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 48.6 – 36.7 – 45.4 – S
Single modes 46.2 7.2 37.3 2.9 44.0 3.4 S
Truck 38.2 16.7 40.2 9.0 46.3 12.8 S
Rail S S S S S S 28.3
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.0
Parcel, USPS or courier – – – – – – –
All other multiple modes S S S S S S 29.0
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 37.6 – 24.3 – 26.5 – S
Single modes 37.6 – 24.3 – 26.5 – S
Truck S S S S S S 27.9
Rail 41.1 12.7 40.9 15.6 40.9 15.0 25.8
All other Single modes S S S S S S S
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 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 32.4 – 25.0 – 27.0 – 21.1
Single modes 27.5 5.2 25.0 1.8 26.7 2.4 30.9
Truck 27.7 5.2 23.6 4.1 18.4 10.5 31.6
Rail 37.8 3.3 37.8 4.3 41.7 10.7 26.9
All other Single modes S S S S S S 27.1
Multiple modes S S S S S S 27.0
Parcel, USPS or courier S S S S S S 28.1
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 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 37.1 – 25.0 – 33.7 – 20.3
Single modes 25.2 6.7 25.0 1.0 33.9 2.7 19.7
Truck 27.6 8.0 20.9 7.5 30.6 11.2 20.3
Rail S S S S S S 28.0
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 11.6
Parcel, USPS or courier S S S S S S 11.6
All other multiple modes S S S S S S 29.8
Other and unknown modes S S S S 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 16.9 – 18.3 – 16.7 – 21.0
Single modes 18.7 3.9 20.2 2.9 16.9 1.3 22.3
Truck 26.0 9.9 33.6 11.4 25.6 11.8 27.1
Rail 25.8 10.2 21.8 10.0 24.4 12.1 12.8
All other Single modes 49.9 – S S S S 25.8
Multiple modes S S S S S S 29.6
Parcel, USPS or courier S S S S S S 31.3
All other multiple modes S S S S S S 31.6
Other and unknown modes 37.6 4.0 39.2 2.9 33.7 – 29.8

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 43.7 – 33.3 – 29.4 – 21.6
Single modes 27.6 19.9 35.8 7.1 30.8 10.1 S
Truck S S 36.1 7.2 31.5 10.5 S
Rail – – – – – – –
All other Single modes S S S S S S 24.7
Multiple modes S S S S S S 22.4
Parcel, USPS or courier S S S S S S 22.4
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 36.3 – 44.9 – 48.5 – S
Single modes 37.7 5.7 45.0 0.6 49.5 2.2 S
Truck 37.7 5.7 38.8 5.7 40.4 7.0 S
Rail S S S S S S 31.6
All other Single modes S S S S S S 28.3
Multiple modes S S S S S S 26.2
Parcel, USPS or courier S S S S S S 26.2
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 33.9

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 42.3 – S
Single modes S S S S 44.1 10.3 S
Truck S S S S 44.1 10.3 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 – – – – – – –

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.