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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 8.8 – 18.6 – 12.1 – 10.8
Single modes 9.2 3.1 18.8 0.4 12.5 1.0 25.6
Truck 11.5 3.7 24.4 6.7 10.1 5.9 29.3
Rail S S 40.3 2.9 S S 19.6
All other Single modes 28.7 2.6 42.0 6.5 S S 11.3
Multiple modes 25.8 2.9 27.9 0.1 27.6 0.4 10.7
Parcel, USPS or courier 26.0 2.9 32.5 0.1 32.0 0.3 10.7
All other multiple modes S S 39.9 – S S S
Other and unknown modes 26.2 0.5 31.0 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 S S S S S S 25.8
Single modes S S S S S S 25.7
Truck S S S S S S 25.7
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 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 24.6 – 21.0 – 30.8 – S
Single modes 24.7 1.2 21.1 0.9 31.8 2.1 S
Truck 24.7 1.5 21.1 1.0 31.5 2.3 S
Rail 42.7 0.3 S S S S 28.2
All other Single modes – – – – – – –
Multiple modes S S S S S S 34.3
Parcel, USPS or courier S S S S S S 28.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 29.8

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 20.6 – 32.5 – 27.6 – 16.8
Single modes 20.6 – 32.5 – 27.6 – 16.8
Truck 16.7 3.5 31.6 2.1 31.8 7.3 15.7
Rail S S S S S S 33.6
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
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 26.7 – 31.3 – 37.7 – S
Single modes 26.7 – 31.3 – 37.7 – S
Truck 39.1 10.7 46.7 11.2 39.2 13.1 49.7
Rail S S 49.1 4.2 S S 23.6
All other Single modes 42.5 10.7 42.1 10.3 S S S
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 12.4 – 17.7 – 28.3 – 19.6
Single modes 15.9 4.7 18.2 1.6 29.1 1.9 S
Truck 16.4 4.8 20.8 6.1 31.5 7.9 S
Rail S S S S S S 15.5
All other Single modes S S S S S S 25.6
Multiple modes 32.9 4.7 S S S S 22.9
Parcel, USPS or courier 32.9 4.7 S S S S 22.9
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 S S 46.9 – 37.0 – 35.3
Single modes S S 48.0 1.8 37.2 0.9 S
Truck S S 48.1 1.9 37.6 1.3 47.4
Rail S S S S S S 31.6
All other Single modes 49.8 1.9 S S S S 23.0
Multiple modes 36.8 1.1 S S 42.2 0.9 22.3
Parcel, USPS or courier 36.9 1.1 S S 38.1 1.0 22.1
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 44.6 1.9 41.4 0.4 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 23.2 – 41.1 – 43.8 – 24.4
Single modes 27.6 6.1 43.6 6.1 48.3 7.5 44.7
Truck 28.3 6.2 43.6 6.1 48.4 7.5 45.1
Rail – – – – – – –
All other Single modes 40.3 0.7 43.7 – 36.1 0.2 17.9
Multiple modes 42.7 3.7 S S 49.8 0.4 13.9
Parcel, USPS or courier 43.6 3.7 46.9 – S S 14.0
All other multiple modes S S S S S S 31.6
Other and unknown modes 43.1 3.9 42.2 6.1 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 28.6 – 19.1 – 15.2 – 13.1
Single modes 34.1 7.1 23.5 6.7 13.9 4.2 20.2
Truck 39.7 7.6 24.0 7.4 15.9 6.1 28.9
Rail – – – – – – –
All other Single modes S S 32.1 1.4 S S 18.0
Multiple modes 29.0 6.4 22.9 5.2 34.0 4.8 11.7
Parcel, USPS or courier 30.0 6.5 22.9 2.2 25.4 3.0 11.7
All other multiple modes S S S S S S 30.8
Other and unknown modes 27.7 3.2 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 26.9 – 36.6 – 36.6 – 12.9
Single modes 23.4 5.1 37.6 3.3 36.1 3.2 24.2
Truck 23.6 5.2 37.6 3.3 36.1 3.6 25.9
Rail – – – – – – –
All other Single modes S S S S S S 28.2
Multiple modes S S S S S S 20.0
Parcel, USPS or courier S S S S S S 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 39.5 – S S S S 35.4
Single modes 39.9 12.2 S S S S 41.9
Truck 39.9 12.2 S S S S 41.9
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes 45.8 12.2 S S 45.6 11.2 41.3
Parcel, USPS or courier 45.8 12.2 S S 45.6 11.2 41.3
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.