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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 – 16.8 – 24.8 – 20.4
Single modes 10.6 3.4 17.7 2.4 25.5 2.5 41.1
Truck 10.8 4.2 16.7 2.3 21.6 3.7 36.6
Rail 38.4 0.2 S S 49.4 3.9 21.3
All other Single modes 49.3 1.8 36.4 1.1 36.8 0.2 5.2
Multiple modes 35.7 3.3 39.9 0.2 36.9 1.1 10.7
Parcel, USPS or courier 35.8 3.2 45.6 0.1 33.0 0.3 10.7
All other multiple modes 46.2 0.2 43.5 – 47.2 0.9 22.2
Other and unknown modes 25.5 0.3 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 31.3 – 38.7 – 33.2 – 21.8
Single modes 32.5 4.2 38.8 1.1 33.4 2.8 17.4
Truck 32.5 4.2 38.8 1.1 33.4 2.8 17.4
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 27.1
Parcel, USPS or courier S S S S S S 27.1
All other multiple modes – – – – – – –
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 22.0 – 40.7 – 27.1 – S
Single modes 21.9 0.2 40.7 – 27.1 – S
Truck 21.9 0.2 40.7 – 27.2 0.5 S
Rail S S S S S S 31.6
All other Single modes – – – – – – –
Multiple modes S S S S S S 30.4
Parcel, USPS or courier S S S S S S 30.4
All other multiple modes – – – – – – –
Other and unknown modes – – – – – – –

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 36.1 – 48.9 – 31.7
Single modes S S 38.1 3.8 S S 30.5
Truck S S 38.0 10.1 S S 34.2
Rail S S S S S S 32.4
All other Single modes 41.0 1.8 41.4 12.5 41.4 0.7 25.8
Multiple modes S S S S S S 32.5
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 31.7

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 S S S S 26.2
Single modes S S S S S S 26.2
Truck S S S S S S 26.2
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
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 31.5 – S S S S S
Single modes 29.2 11.9 S S S S S
Truck 33.3 11.9 S S S S S
Rail S S S S S S 31.6
All other Single modes S S S S S S 27.9
Multiple modes S S S S S S 29.7
Parcel, USPS or courier S S S S S S 29.7
All other multiple modes – – – – – – –
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 18.3 – 32.6 – 24.9 – 24.5
Single modes 18.8 3.0 32.5 0.8 24.8 1.9 S
Truck 18.7 3.1 32.6 0.9 24.6 1.9 S
Rail S S S S S S 30.2
All other Single modes S S S S S S 27.2
Multiple modes 40.2 2.1 41.0 0.6 42.1 1.4 14.3
Parcel, USPS or courier 41.2 2.1 40.5 0.6 43.9 1.4 14.3
All other multiple modes S S S S S S 31.6
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 11.7 – 14.5 – 16.3 – 27.9
Single modes 11.7 1.7 14.9 2.4 16.4 0.5 48.1
Truck 11.8 1.5 14.9 2.8 17.0 4.1 S
Rail S S S S S S 28.0
All other Single modes 22.4 0.3 49.7 – 47.9 0.2 9.7
Multiple modes 20.5 1.6 33.7 0.2 42.0 0.5 12.4
Parcel, USPS or courier 20.5 1.5 39.0 0.2 S S 12.4
All other multiple modes S S S S S S 30.8
Other and unknown modes 43.5 0.3 46.7 2.3 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 23.7 – 23.0 – 23.6 – 19.3
Single modes 21.0 7.5 24.1 5.4 21.3 7.6 S
Truck 18.8 7.6 24.5 5.7 22.6 8.0 S
Rail S S S S S S 29.9
All other Single modes S S 39.7 0.3 S S 8.4
Multiple modes S S S S 46.2 7.7 11.9
Parcel, USPS or courier S S S S S S 11.9
All other multiple modes 47.1 0.6 48.2 1.5 49.2 6.6 23.7
Other and unknown modes 43.2 1.0 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 15.9 – 27.4 – 33.1 – 29.2
Single modes 16.0 1.8 27.8 0.9 34.4 2.8 36.7
Truck 16.0 1.8 27.8 0.9 34.4 2.8 36.7
Rail – – – – – – –
All other Single modes S S S S S S 28.6
Multiple modes 43.2 1.7 S S S S 15.2
Parcel, USPS or courier 43.2 1.7 S S S S 15.2
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 49.1 – 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 43.6 18.2 42.4
Parcel, USPS or courier S S S S 43.6 18.2 42.4
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.