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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 49.5 – 12.5 – 11.2 – 12.9
Single modes S S 12.8 1.1 12.1 3.8 15.4
Truck 48.0 3.8 12.6 1.1 11.0 3.9 13.0
Rail S S S S S S S
All other Single modes S S S S S S 8.2
Multiple modes 44.4 3.4 15.4 0.3 22.4 1.7 7.0
Parcel, USPS or courier 44.5 3.4 16.9 0.3 24.7 1.7 7.0
All other multiple modes 30.7 – S S S S 37.3
Other and unknown modes 40.6 0.9 29.3 1.0 S S 48.2

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 26.5 – 33.4 – 48.2 – 37.1
Single modes 26.5 – 33.4 – 48.2 – 37.7
Truck 26.5 0.3 33.6 0.7 S S 43.9
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 29.8

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 34.7 – 41.0 – S S 25.2
Single modes 34.7 0.1 41.0 0.1 S S 24.9
Truck 34.7 0.1 41.0 0.1 S S 24.9
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 41.9
Parcel, USPS or courier S S S S S S 41.9
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 28.2

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 21.8 – S S 49.8
Single modes S S 21.4 1.2 S S 46.9
Truck S S 21.5 1.3 48.3 1.8 47.1
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 26.5

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 45.2 – S S S S S
Single modes 45.2 10.5 S S S S 19.6
Truck 45.2 10.5 S S S S 19.6
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 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 19.7 – 35.7 – 24.3 – 18.6
Single modes 11.2 9.8 37.4 6.9 28.3 7.3 S
Truck 13.3 8.9 40.7 8.2 28.0 10.2 S
Rail S S S S S S 36.1
All other Single modes 39.6 0.7 S S S S 22.8
Multiple modes S S 33.7 4.1 38.4 2.4 19.7
Parcel, USPS or courier S S 44.5 4.1 38.9 1.4 19.5
All other multiple modes S S S S S S 31.0
Other and unknown modes 35.8 0.9 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 21.3 – 14.8 – 15.5 – 13.6
Single modes 26.2 7.3 16.9 4.3 17.7 6.0 38.8
Truck 26.7 7.0 16.7 4.2 18.3 5.7 37.7
Rail S S S S S S S
All other Single modes 39.3 0.2 48.5 – S S 33.6
Multiple modes 29.2 6.4 24.9 2.1 38.5 4.1 7.5
Parcel, USPS or courier 29.5 6.5 26.2 2.1 39.6 4.2 7.5
All other multiple modes S S S S S S S
Other and unknown modes S S S S S S 26.1

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 23.8 – 43.1 – 37.5 – 10.7
Single modes 27.1 3.4 44.0 3.1 40.3 4.0 19.6
Truck 27.9 4.3 44.1 3.2 40.7 5.1 21.3
Rail – – – – – – –
All other Single modes S S S S S S 25.9
Multiple modes 21.3 3.1 26.0 1.3 28.5 2.5 13.3
Parcel, USPS or courier 21.7 3.0 27.0 1.2 34.2 1.6 13.4
All other multiple modes S S S S S S 27.9
Other and unknown modes S S 48.2 2.4 S S 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 S S 46.9 – S S 13.5
Single modes S S 47.4 3.9 S S 17.5
Truck S S 46.8 4.6 S S 34.3
Rail – – – – – – –
All other Single modes S S S S S S 13.4
Multiple modes S S 49.0 2.0 S S 10.3
Parcel, USPS or courier S S 49.1 2.0 S S 10.4
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 49.8 2.4 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 15.1 – 19.7 – 17.9 – 13.3
Single modes 21.3 6.7 20.0 3.0 22.6 7.0 14.6
Truck 21.3 6.7 20.0 3.0 22.5 7.0 14.8
Rail – – – – – – –
All other Single modes 31.3 – S S S S 26.1
Multiple modes 23.3 5.8 20.5 1.7 27.2 6.6 10.9
Parcel, USPS or courier 23.4 5.8 20.6 1.7 28.0 6.6 10.9
All other multiple modes S S S S S S 36.8
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 28.6
Single modes S S S S S S 33.0
Truck S S S S S S S
Rail – – – – – – –
All other Single modes S S S S S S 30.0
Multiple modes S S S S S S 28.2
Parcel, USPS or courier S S S S S S 28.2
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.