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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

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 12.7 – 29.8 – 28.2 – 13.6
Single modes 14.0 3.4 30.9 1.7 29.3 1.5 23.8
Truck 14.2 3.1 17.8 6.8 21.8 6.0 24.2
Rail S S S S S S 26.7
All other Single modes S S S S S S 11.7
Multiple modes 33.4 2.9 27.7 0.1 21.2 0.4 14.2
Parcel, USPS or courier 34.2 2.9 39.6 0.2 37.3 0.4 12.2
All other multiple modes S S 47.4 – S S 26.5
Other and unknown modes 43.5 0.9 36.2 1.6 42.7 1.3 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 48.1 – 33.8 – 34.3 – 24.4
Single modes 48.1 – 33.8 – 34.3 – 24.4
Truck 48.1 – 33.8 – 34.3 – 24.4
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
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 41.0 – 35.6 – 38.5 – S
Single modes 41.0 – 35.6 – 38.5 – S
Truck 41.0 – 35.6 – 38.5 – S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
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 38.6 – 38.3 – 34.1 – S
Single modes 42.3 10.0 41.0 10.1 37.6 9.6 S
Truck 48.2 12.3 42.2 13.8 43.9 12.7 S
Rail S S S S S S 29.8
All other Single modes – – – – – – –
Multiple modes S S S S S S 35.8
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 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 S S S S S S 32.1
Single modes S S S S S S 32.1
Truck S S S S S S 32.4
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 – – – – – – –

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 29.4 – 39.4 – 48.2 – 18.9
Single modes 35.5 7.5 45.5 9.0 S S 19.8
Truck 34.7 7.1 44.9 8.2 49.3 9.3 19.9
Rail S S S S S S 31.6
All other Single modes S S S S S S 31.8
Multiple modes 36.0 2.8 37.0 1.1 S S 42.3
Parcel, USPS or courier 40.4 2.8 S S S S 26.2
All other multiple modes S S S S S S 28.8
Other and unknown modes 43.9 5.2 43.7 9.0 40.6 11.0 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 22.9 – 25.7 – 21.9 – 12.5
Single modes 24.2 5.3 26.0 1.0 22.3 1.5 13.4
Truck 23.6 5.2 26.0 1.0 22.1 1.5 13.1
Rail – – – – – – –
All other Single modes S S S S S S 20.4
Multiple modes S S S S S S 21.9
Parcel, USPS or courier S S S S S S 19.2
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 30.2

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 37.6 – 38.2 – 32.3 – 16.4
Single modes 42.5 5.6 39.1 2.5 33.1 1.5 25.5
Truck 43.1 5.8 39.2 2.4 33.3 1.6 25.8
Rail S S S S S S 31.6
All other Single modes S S S S S S 20.3
Multiple modes S S S S S S 18.3
Parcel, USPS or courier S S S S S S 18.3
All other multiple modes – – – – – – –
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 40.1 – 34.0 – 30.1 – 18.6
Single modes 43.9 4.4 34.1 0.5 30.3 0.7 23.7
Truck 36.2 5.4 35.4 3.1 31.8 4.2 23.6
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 47.4 0.2 46.5 0.3 24.1
Parcel, USPS or courier S S 47.4 0.2 46.5 0.3 24.1
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 40.0 – 46.9 – 46.4 – 23.7
Single modes 39.8 9.5 46.9 1.8 46.4 8.5 19.9
Truck 44.8 9.2 46.2 10.0 42.8 13.9 20.8
Rail S S S S S S 28.3
All other Single modes – – – – – – –
Multiple modes S S S S 47.9 8.6 25.5
Parcel, USPS or courier S S S S 47.9 8.6 25.5
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 44.1
Single modes S S S S S S 44.1
Truck S S S S S S 44.1
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
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.