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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 6.8 – 20.0 – 29.4 – 12.0
Single modes 8.3 3.3 20.2 1.5 22.6 4.0 21.0
Truck 8.3 3.1 21.5 3.9 17.1 10.8 21.9
Rail S S S S S S 41.2
All other Single modes 28.3 0.8 43.4 3.5 S S 8.4
Multiple modes 13.0 2.8 S S S S 6.8
Parcel, USPS or courier 14.0 3.2 14.0 0.3 19.0 0.8 6.7
All other multiple modes S S S S S S 21.8
Other and unknown modes 23.8 1.4 47.4 1.0 29.2 1.2 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 46.1 – S S 13.9 – S
Single modes 44.9 5.6 S S 14.8 3.3 S
Truck 44.9 5.6 S S 14.8 3.3 S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.3
Parcel, USPS or courier S S S S S S 30.3
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 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 18.4 – 16.0 – 30.7 – 22.7
Single modes 19.4 3.1 17.4 3.2 31.7 3.7 23.5
Truck 19.6 3.3 17.5 3.4 32.0 4.7 23.5
Rail – – – – – – –
All other Single modes S S S S S S 30.3
Multiple modes 43.2 0.4 S S S S 25.2
Parcel, USPS or courier S S S S S S 29.8
All other multiple modes S S S S S S 33.4
Other and unknown modes S S S S S S S

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 45.6 – 45.0 – S S S
Single modes 49.3 8.6 45.1 – S S 30.7
Truck 49.3 8.6 45.1 – S S 31.2
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 31.1
Parcel, USPS or courier S S S S S S 31.1
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 42.3 – 36.3 – 48.3 – S
Single modes 42.7 2.1 36.4 0.2 48.6 4.9 S
Truck 43.3 6.8 38.4 9.5 S S S
Rail – – – – – – –
All other Single modes S S S S S S 25.8
Multiple modes S S S S S S 41.5
Parcel, USPS or courier S S S S S S 41.5
All other multiple modes – – – – – – –
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 31.7 – 47.6 – S S 26.0
Single modes 28.9 3.6 S S S S 45.3
Truck 28.8 3.4 48.2 3.5 S S 46.1
Rail S S S S S S 31.8
All other Single modes 49.8 1.4 S S 33.9 – 10.0
Multiple modes 42.2 3.2 S S 48.1 4.3 20.5
Parcel, USPS or courier 23.5 4.0 41.8 1.5 35.1 3.6 21.9
All other multiple modes S S S S S S 30.2
Other and unknown modes S S S S S S 29.5

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 18.9 – 26.2 – S S 16.2
Single modes 28.6 7.9 26.4 6.5 S S 24.8
Truck 29.2 8.1 26.7 6.9 S S 28.6
Rail S S S S S S 27.9
All other Single modes 37.8 0.4 S S S S 11.0
Multiple modes 30.3 6.6 S S S S 14.2
Parcel, USPS or courier 14.2 5.8 24.9 1.7 36.8 3.8 13.6
All other multiple modes S S S S S S 29.1
Other and unknown modes 39.4 3.3 49.9 1.2 45.1 2.1 46.2

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 17.8 – S S 17.5 – S
Single modes 20.1 5.6 S S 18.7 5.8 S
Truck 20.9 6.5 S S 21.8 8.2 S
Rail S S S S S S 31.6
All other Single modes S S S S S S 9.5
Multiple modes 21.1 4.5 S S S S 22.8
Parcel, USPS or courier 20.8 4.5 23.4 0.4 35.4 0.9 22.8
All other multiple modes S S S S S S 31.7
Other and unknown modes 33.3 1.2 31.0 2.1 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 10.8 – 42.1 – 28.7 – 10.3
Single modes 19.0 5.3 44.2 3.8 30.6 4.9 31.8
Truck 21.2 5.7 44.2 4.1 30.9 5.7 47.2
Rail – – – – – – –
All other Single modes 33.1 1.8 22.3 0.5 20.2 1.1 8.9
Multiple modes 7.6 5.6 29.9 3.0 23.1 4.9 5.2
Parcel, USPS or courier 7.6 5.6 29.9 3.0 23.1 4.9 5.2
All other multiple modes S S S S S S 31.6
Other and unknown modes 39.0 3.7 S S 34.4 1.1 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 13.8 – 40.2 – 33.1 – 14.7
Single modes 22.3 7.9 43.5 4.6 35.8 4.9 41.7
Truck 22.9 8.0 45.2 4.6 36.0 5.0 48.8
Rail S S S S S S S
All other Single modes 32.1 0.6 S S 41.3 0.4 10.3
Multiple modes 27.4 7.7 20.2 1.0 34.4 5.0 7.7
Parcel, USPS or courier 27.3 7.7 24.4 1.0 26.0 3.4 7.7
All other multiple modes S S S S S S 31.6
Other and unknown modes 29.9 2.1 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 31.7 – 48.9 – 33.4 – 37.6
Single modes 37.8 13.7 S S 44.3 14.2 S
Truck 37.8 13.7 S S 44.3 14.2 S
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes 49.1 14.2 37.8 18.0 39.9 16.2 16.9
Parcel, USPS or courier 49.1 14.2 37.8 18.0 39.9 16.2 16.9
All other multiple modes – – – – – – –
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.