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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 4.3 – 13.6 – 16.1 – 15.8
Single modes 5.0 1.4 14.0 0.8 16.6 3.3 18.4
Truck 5.1 1.4 15.7 3.6 13.6 6.3 18.8
Rail 26.3 0.5 37.4 3.3 37.5 5.6 13.0
All other Single modes 29.3 0.3 S S 48.4 0.2 6.0
Multiple modes 12.3 1.3 30.2 0.8 36.7 3.4 8.9
Parcel, USPS or courier 17.5 1.4 32.3 0.1 38.6 0.5 9.0
All other multiple modes 30.7 0.6 37.1 0.9 41.1 3.5 26.7
Other and unknown modes 30.1 0.6 28.0 0.1 41.4 0.8 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 36.9 – S S S S S
Single modes 37.1 0.5 S S S S S
Truck 37.1 0.5 S S S S S
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 29.8
Parcel, USPS or courier S S S S S S 29.8
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S S

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 20.8 – 23.1 – 45.9 – 40.1
Single modes 21.5 1.7 23.4 0.7 47.9 4.9 S
Truck 21.6 1.7 23.4 0.9 48.1 5.3 S
Rail S S S S S S S
All other Single modes – – – – – – –
Multiple modes 30.9 1.7 36.6 0.6 43.0 4.9 31.8
Parcel, USPS or courier 46.6 0.2 42.9 – 46.9 – 25.9
All other multiple modes 43.6 1.8 40.9 0.6 45.0 4.9 17.1
Other and unknown modes S S S S S S 30.8

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 24.6 – 23.7 – 25.7 – 18.2
Single modes 24.6 – 23.7 – 25.7 – 18.2
Truck 25.4 2.5 23.8 3.7 23.0 10.5 19.9
Rail S S S S S S 26.6
All other Single modes – – – – – – –
Multiple modes S S S S S S 31.6
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes – – – – – – –
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 20.0 – 16.8 – 35.9 – S
Single modes 19.4 0.6 16.5 0.5 35.9 1.7 S
Truck 28.8 11.5 17.3 13.5 33.0 19.9 S
Rail 42.5 11.6 42.6 13.3 43.8 19.4 26.2
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 33.0
Parcel, USPS or courier S S S S S S 30.2
All other multiple modes S S S S S S 30.0
Other and unknown modes S S S S S S S

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 23.0 – 29.8 – 31.6 – 18.7
Single modes 24.9 6.0 28.2 3.5 27.6 10.2 36.4
Truck 25.1 6.1 28.2 3.5 27.6 10.2 37.4
Rail – – – – – – –
All other Single modes S S 47.6 – S S 29.5
Multiple modes 26.0 5.9 43.3 3.8 43.9 10.2 18.0
Parcel, USPS or courier 40.4 7.3 30.9 1.1 39.7 0.9 20.2
All other multiple modes 44.1 3.5 44.4 4.3 44.5 10.7 26.1
Other and unknown modes S S S S S S 25.8

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 13.9 – 26.8 – 17.2 – 10.4
Single modes 17.1 4.8 27.0 0.7 17.3 5.4 20.0
Truck 17.2 4.9 27.0 0.7 17.2 5.4 19.1
Rail S S S S S S 31.6
All other Single modes S S S S S S 24.0
Multiple modes 13.6 2.2 23.5 0.7 40.2 2.5 2.3
Parcel, USPS or courier 14.7 2.0 21.6 0.3 21.8 0.7 2.3
All other multiple modes 40.2 0.5 S S S S 24.4
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 9.7 – 11.8 – 13.6 – 32.5
Single modes 10.3 2.4 11.5 0.6 12.9 0.8 35.5
Truck 9.9 3.3 13.1 3.1 16.1 5.0 36.3
Rail 23.9 1.2 21.3 2.9 26.4 4.6 17.5
All other Single modes S S S S S S 10.3
Multiple modes 34.1 2.1 S S 34.5 0.3 24.6
Parcel, USPS or courier 34.2 2.1 30.4 0.1 40.7 0.2 24.5
All other multiple modes S S S S S S 43.5
Other and unknown modes 41.8 0.6 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 13.1 – 19.4 – 19.1 – 15.2
Single modes 15.6 5.4 21.7 4.9 21.6 5.0 38.6
Truck 15.8 5.3 21.8 4.9 21.7 5.3 40.9
Rail 44.4 0.2 49.5 0.3 S S 29.6
All other Single modes 24.5 0.6 39.6 0.3 41.5 1.0 15.8
Multiple modes 28.8 5.1 S S S S 6.2
Parcel, USPS or courier 30.7 5.3 S S S S 6.4
All other multiple modes S S S S S S 30.3
Other and unknown modes 36.3 1.4 39.9 1.5 46.7 0.9 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 13.7 – 21.7 – 20.5 – 25.8
Single modes 13.4 2.3 21.6 1.1 22.0 4.5 18.8
Truck 13.6 2.2 21.6 1.1 22.2 4.5 20.4
Rail – – – – – – –
All other Single modes 32.6 0.5 31.5 – 40.3 0.4 16.3
Multiple modes 28.3 2.2 46.3 0.8 S S 24.0
Parcel, USPS or courier 36.6 2.2 37.8 0.7 18.3 0.9 23.9
All other multiple modes S S S S S S 29.8
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 31.9
Single modes S S S S S S 29.1
Truck S S S S S S 25.8
Rail – – – – – – –
All other Single modes S S S S S S 30.2
Multiple modes S S S S S S 28.6
Parcel, USPS or courier S S S S S S 28.6
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 30.4

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.