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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 22.2 – 20.6 – 16.4 – 27.5
Single modes 24.5 5.0 20.9 1.2 14.4 3.2 S
Truck 25.9 5.7 22.0 1.8 16.3 5.5 28.2
Rail 26.4 0.5 24.1 1.6 25.0 5.1 14.5
All other Single modes 37.0 1.4 S S S S 20.3
Multiple modes 43.3 4.2 S S S S 14.8
Parcel, USPS or courier S S 37.9 0.2 43.1 0.5 14.9
All other multiple modes S S S S S S 27.1
Other and unknown modes 35.4 1.5 S S 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 S S 38.5 – S S S
Single modes 46.2 5.3 33.8 6.5 33.8 18.0 S
Truck 46.4 4.9 38.8 7.1 40.7 14.6 S
Rail S S S S S S 27.9
All other Single modes – – – – – – –
Multiple modes S S S S S S 31.1
Parcel, USPS or courier – – – – – – –
All other multiple modes S S S S S S 31.1
Other and unknown modes – – – – – – –

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 46.4 – 20.9 – 38.7 – S
Single modes 48.6 4.6 20.4 1.6 26.2 12.5 S
Truck 48.6 4.6 20.4 1.6 26.2 12.5 S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.2
Parcel, USPS or courier S S S S S S 30.3
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 31.4 – 29.5 – 41.4 – S
Single modes 32.0 1.8 30.1 2.3 44.1 7.6 S
Truck 40.7 15.5 39.5 16.9 45.9 17.2 S
Rail S S S S S S 29.8
All other Single modes S S S S S S 27.9
Multiple modes S S S S S S 31.8
Parcel, USPS or courier S S S S S S 31.6
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 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 34.3 – 37.0 – 36.5 – 34.3
Single modes 34.5 0.3 37.0 – 36.5 – 35.6
Truck 34.5 0.3 37.0 – 36.5 – 35.6
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 38.4
Parcel, USPS or courier S S S S S S 38.4
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 30.8 – 37.6 – 39.4 – S
Single modes 31.1 2.7 38.2 2.2 39.7 2.1 S
Truck 32.0 3.2 37.6 8.0 27.1 14.6 S
Rail S S S S S S 27.8
All other Single modes S S S S S S 25.5
Multiple modes 33.9 2.7 S S S S 20.1
Parcel, USPS or courier 22.8 2.4 36.0 0.3 42.3 0.1 20.2
All other multiple modes S S S S S S 31.6
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 33.2 – S S 36.3 – 15.2
Single modes 20.1 10.0 S S 36.6 0.6 27.4
Truck 21.6 9.8 S S 41.7 7.2 28.8
Rail 46.2 2.6 44.6 4.1 S S 26.9
All other Single modes S S S S S S 26.7
Multiple modes S S S S S S 17.9
Parcel, USPS or courier S S S S S S 17.9
All other multiple modes – – – – – – –
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 15.1 – 46.2 – S S 35.9
Single modes 15.8 2.7 46.3 0.8 S S 40.3
Truck 15.3 3.6 46.4 1.6 48.6 8.7 41.1
Rail S S S S S S 40.5
All other Single modes S S 30.9 – S S 48.8
Multiple modes 38.7 2.1 S S S S 18.0
Parcel, USPS or courier 41.7 2.2 35.4 0.4 49.8 0.6 19.0
All other multiple modes S S S S S S 31.5
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 18.9 – 25.1 – S S 22.7
Single modes 19.0 8.7 33.0 11.0 S S 29.6
Truck 28.5 9.5 33.1 10.9 S S S
Rail – – – – – – –
All other Single modes 39.3 9.6 S S S S 23.9
Multiple modes 42.3 6.4 34.2 1.6 35.0 5.8 16.3
Parcel, USPS or courier 42.7 6.3 40.1 1.3 48.1 5.6 16.4
All other multiple modes S S S S S S 29.8
Other and unknown modes 48.2 8.9 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 S S S S S S 45.4
Single modes S S S S S S 24.3
Truck S S S S S S 24.3
Rail – – – – – – –
All other Single modes S S S S S S 30.4
Multiple modes 37.5 7.9 39.7 5.2 45.3 7.9 20.0
Parcel, USPS or courier 37.5 7.9 39.7 5.2 45.3 7.9 20.0
All other multiple modes – – – – – – –
Other and unknown modes S S 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 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 29.5
Parcel, USPS or courier S S S S S S 29.5
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.