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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 8.4 – 12.7 – 18.8 – 14.8
Single modes 9.6 3.1 13.1 1.8 21.3 3.6 18.7
Truck 10.4 3.4 10.9 3.3 20.1 4.1 18.9
Rail 15.6 1.0 30.7 1.5 32.9 3.1 7.8
All other Single modes 39.6 0.6 S S S S 13.4
Multiple modes 28.1 3.3 26.1 0.4 23.9 3.2 13.9
Parcel, USPS or courier 18.6 1.4 22.9 – 17.6 0.1 13.7
All other multiple modes 43.7 2.6 30.5 0.4 25.4 3.3 20.5
Other and unknown modes 37.0 0.9 47.9 1.7 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 44.7 – S S S S 24.1
Single modes 44.7 – S S S S 32.3
Truck 44.7 – S S S S 32.3
Rail – – – – – – –
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 – – – – – – –

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 29.0 – 34.7 – S S 39.3
Single modes 30.0 6.8 34.8 5.3 S S S
Truck 29.8 6.8 34.8 5.2 S S S
Rail S S S S S S 31.6
All other Single modes – – – – – – –
Multiple modes S S S S S S 41.0
Parcel, USPS or courier S S S S S S 32.0
All other multiple modes S S S S S S 31.6
Other and unknown modes 41.5 6.9 41.4 5.3 S S 42.9

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 35.8 – 44.7 – S
Single modes S S 38.7 5.7 41.6 4.2 S
Truck S S 39.7 6.1 47.2 9.1 S
Rail S S S S 48.1 10.8 27.6
All other Single modes – – – – – – –
Multiple modes S S S S S S 30.3
Parcel, USPS or courier – – – – – – –
All other multiple modes S S S S S S 30.3
Other and unknown modes 47.4 6.8 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 23.8 – 26.8 – S S 36.7
Single modes 23.5 0.4 27.1 1.2 S S 36.5
Truck 33.6 11.2 36.3 11.9 S S 28.8
Rail S S S S S S 27.8
All other Single modes 42.9 11.8 S S S S S
Multiple modes S S S S S S 42.1
Parcel, USPS or courier S S S S S S 42.7
All other multiple modes S S S S S S 31.6
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 41.3 – 35.0 – 34.7 – 8.2
Single modes 48.5 6.0 35.5 0.8 33.2 3.6 14.2
Truck S S 36.3 2.0 31.4 6.7 14.3
Rail 45.6 2.6 S S S S 21.6
All other Single modes S S 50.0 – 49.4 0.3 26.0
Multiple modes S S S S S S 9.3
Parcel, USPS or courier S S 33.6 0.7 41.4 2.1 8.2
All other multiple modes S S S S S S 23.8
Other and unknown modes 48.8 3.7 S S S S 38.7

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 25.6 – 13.3 – 29.3 – 10.1
Single modes 36.0 8.8 14.7 2.9 31.3 2.7 24.5
Truck 36.2 8.8 15.0 3.6 32.6 4.0 26.4
Rail S S S S S S 31.2
All other Single modes 40.5 0.1 S S 48.9 0.3 21.7
Multiple modes 42.3 8.9 48.6 2.8 S S 15.1
Parcel, USPS or courier 42.3 8.9 48.6 2.8 S S 15.1
All other multiple modes – – – – – – –
Other and unknown modes 18.4 0.5 23.5 0.3 32.1 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 14.3 – 20.1 – 11.5 – 16.1
Single modes 13.7 1.9 21.4 5.5 9.8 3.5 16.2
Truck 14.1 1.1 21.7 5.5 10.1 4.1 17.0
Rail 29.1 1.4 22.6 0.7 26.3 1.7 18.0
All other Single modes 28.3 – 25.4 – 25.8 – 13.1
Multiple modes 16.3 2.0 39.5 0.5 46.0 2.2 12.6
Parcel, USPS or courier 22.5 2.2 21.0 – 32.6 0.2 12.6
All other multiple modes S S S S S S 28.3
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 15.0 – 14.9 – 19.8 – 27.8
Single modes 16.1 5.1 16.0 2.6 22.2 6.3 S
Truck 18.0 5.1 17.3 2.6 27.5 5.8 S
Rail 21.7 3.0 12.0 1.3 14.8 5.3 6.8
All other Single modes 40.6 – S S S S 18.0
Multiple modes 43.9 5.2 40.2 2.5 43.6 6.3 20.9
Parcel, USPS or courier 39.6 1.9 S S 41.3 0.2 22.2
All other multiple modes 49.5 4.2 42.8 2.5 44.2 6.3 14.1
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 30.4 – 41.4 – 34.9 – 42.5
Single modes 26.7 3.4 41.4 1.3 40.2 6.9 46.5
Truck 26.9 3.3 40.0 4.7 47.4 9.2 49.2
Rail S S S S S S 34.6
All other Single modes S S S S S S 26.5
Multiple modes 31.6 3.4 29.1 0.8 35.4 7.1 37.6
Parcel, USPS or courier 35.2 3.4 28.1 0.7 28.1 0.6 37.6
All other multiple modes 28.9 0.2 37.2 0.5 37.1 7.1 21.2
Other and unknown modes S S S S S S 37.0

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 39.1 – S S S S 49.6
Single modes 46.3 14.8 S S S S S
Truck S S S S S S S
Rail S S S S S S 31.6
All other Single modes – – – – – – –
Multiple modes S S S S S S 27.0
Parcel, USPS or courier S S S S S S 28.3
All other multiple modes S S S S S S 29.9
Other and unknown modes S S S S S S 31.6

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.