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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 11.7 – 17.9 – 17.4 – 12.0
Single modes 12.6 2.4 17.6 0.7 17.5 0.8 18.5
Truck 9.5 2.8 22.8 6.7 18.4 11.0 19.4
Rail 29.8 0.9 21.7 7.0 22.5 11.6 14.3
All other Single modes 48.4 2.7 S S 38.2 0.3 2.6
Multiple modes 15.4 2.4 21.4 0.1 30.2 0.5 9.2
Parcel, USPS or courier 15.9 2.4 25.1 0.1 20.4 0.6 9.1
All other multiple modes 42.0 0.2 42.0 0.1 44.3 0.5 S
Other and unknown modes 24.3 0.7 45.6 0.6 37.7 0.3 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 34.8 – 31.5 – 30.1 – 35.1
Single modes 36.3 2.0 32.3 3.0 31.4 3.9 34.1
Truck 36.3 2.0 32.3 3.0 31.4 3.9 34.1
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 23.1
Parcel, USPS or courier S S S S S S 26.7
All other multiple modes S S S S S S 27.9
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 23.5 – 30.9 – S S 32.6
Single modes 23.5 0.7 30.6 0.7 S S 31.2
Truck 19.9 3.7 24.6 4.6 40.0 12.9 25.1
Rail S S S S S S 29.8
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.4
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 30.8
Other and unknown modes S S S S S S 31.6

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 42.1 – 48.5 – S
Single modes S S 44.2 3.8 S S S
Truck S S 45.1 4.1 33.2 11.5 40.7
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 S S S S S S 32.5

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 20.9 – 15.6 – 22.7 – S
Single modes 21.1 0.4 15.6 – 22.8 – S
Truck 40.2 13.5 40.6 11.1 43.0 9.4 S
Rail 24.6 11.4 22.2 10.4 23.3 9.4 16.3
All other Single modes S S S S S S 26.1
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S S
All other multiple modes S S S S S S 29.9
Other and unknown modes S S S S S S 33.7

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 22.1 – S S 32.3 – 28.6
Single modes 26.9 7.1 S S 33.7 5.2 30.0
Truck 29.2 8.2 S S 34.3 6.1 39.0
Rail – – – – – – –
All other Single modes 45.9 2.9 S S S S 15.3
Multiple modes 20.6 7.5 S S 50.0 1.5 36.1
Parcel, USPS or courier 20.6 7.5 S S 50.0 1.5 36.1
All other multiple modes – – – – – – –
Other and unknown modes 40.2 3.2 S S S S 23.4

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 15.3 – 15.1 – 21.6 – 16.4
Single modes 28.2 8.8 19.0 8.5 27.3 8.9 34.8
Truck 28.2 8.8 19.0 8.5 27.4 8.9 39.2
Rail – – – – – – –
All other Single modes 46.5 – S S S S 24.0
Multiple modes 19.3 6.3 29.7 1.2 33.8 6.9 10.2
Parcel, USPS or courier 19.2 6.2 31.0 1.1 33.8 6.9 9.8
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S 46.7 3.5 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 16.7 – S S 40.2 – 16.9
Single modes 16.3 5.3 S S 40.9 7.5 33.5
Truck 16.4 5.4 S S 41.0 7.9 S
Rail – – – – – – –
All other Single modes 37.0 0.6 32.8 – 32.7 0.6 12.8
Multiple modes 32.7 5.1 35.0 2.7 36.5 7.6 10.9
Parcel, USPS or courier 32.7 5.1 35.0 2.7 36.5 7.6 10.9
All other multiple modes – – – – – – –
Other and unknown modes 32.7 2.5 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 24.3 – 36.2 – 21.7 – 11.3
Single modes 29.0 6.2 38.2 4.1 24.1 5.5 18.2
Truck 22.2 7.4 38.4 4.4 24.4 6.2 23.9
Rail – – – – – – –
All other Single modes S S 22.0 0.5 21.9 0.9 3.7
Multiple modes 32.5 5.8 29.6 2.5 35.1 5.0 15.5
Parcel, USPS or courier 32.5 5.8 29.9 2.6 36.6 5.0 13.7
All other multiple modes S S S S S S 31.6
Other and unknown modes 41.3 1.2 41.9 1.7 49.9 1.7 28.8

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 24.1 – 38.6 – 23.7 – 17.8
Single modes 25.4 2.8 40.3 2.5 22.2 5.1 38.2
Truck 25.9 5.3 41.5 4.6 23.0 6.8 40.0
Rail S S S S S S 43.9
All other Single modes S S 48.4 – 43.4 – 12.5
Multiple modes 23.7 2.8 S S S S 9.5
Parcel, USPS or courier 26.2 2.9 46.2 0.5 47.3 0.9 9.5
All other multiple modes S S S S S S 31.7
Other and unknown modes S S S S 47.8 0.9 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 27.9 – S S S S S
Single modes 35.0 12.0 S S S S S
Truck 40.0 12.1 S S S S S
Rail S S S S S S 31.6
All other Single modes S S S S S S 29.9
Multiple modes 49.3 11.0 S S S S 40.4
Parcel, USPS or courier 48.9 10.9 S S S S 33.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 31.0

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.