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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 7.8 – 28.8 – 12.0 – 20.7
Single modes 8.1 2.0 29.0 0.4 12.5 1.6 36.5
Truck 8.7 2.7 33.3 5.2 12.8 9.0 39.0
Rail 20.8 1.2 49.1 5.1 38.3 9.3 17.5
All other Single modes 38.5 0.7 42.3 – 46.8 0.1 8.8
Multiple modes 18.3 2.2 39.8 0.4 34.2 1.6 16.1
Parcel, USPS or courier 18.5 2.2 21.3 0.1 29.4 0.6 16.2
All other multiple modes 36.7 0.1 S S 47.5 1.2 24.0
Other and unknown modes S S 37.9 – 31.4 – 40.8

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 37.7 – 36.1 – 44.3 – S
Single modes 36.8 0.7 36.4 0.5 44.3 0.4 S
Truck 36.8 0.7 36.4 0.5 44.3 0.4 S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 34.9
Parcel, USPS or courier S S S S S S 34.9
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 26.7

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 24.8 – 36.2 – 48.5 – 37.2
Single modes 24.9 0.8 36.3 0.2 48.9 1.1 S
Truck 24.9 0.8 36.3 0.2 48.9 1.1 S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes 35.1 0.8 S S S S 34.7
Parcel, USPS or courier 40.3 0.8 38.4 0.2 36.2 0.8 24.2
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 41.1

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 24.8 – 26.9 – 21.9 – 30.8
Single modes 24.9 0.3 27.0 0.2 21.9 0.2 29.4
Truck 24.9 0.3 27.0 0.2 21.9 0.2 29.6
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 28.8
Parcel, USPS or courier S S S S S S 28.8
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 24.4 – 31.7 – S S 33.6
Single modes 24.4 – 31.7 – S S 33.5
Truck 24.4 – 31.7 – S S 33.5
Rail – – – – – – –
All other Single modes – – – – – – –
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 – – – – – – –

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 28.2 – 29.8 – 30.5 – 17.0
Single modes 24.7 2.7 30.1 1.4 29.9 2.1 17.8
Truck 27.5 6.9 25.4 11.9 28.7 15.6 18.7
Rail S S 49.7 12.0 45.9 16.1 32.6
All other Single modes S S S S S S 23.8
Multiple modes S S S S S S 17.9
Parcel, USPS or courier S S S S S S 20.9
All other multiple modes S S S S S S 29.5
Other and unknown modes S S S S S S 32.0

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 7.2 – 16.4 – 16.6 – 11.3
Single modes 10.8 4.9 16.9 0.9 18.8 3.9 13.1
Truck 10.8 4.9 16.9 0.9 18.8 3.9 13.2
Rail – – – – – – –
All other Single modes S S S S S S 46.0
Multiple modes 21.5 4.2 32.4 0.8 S S 12.4
Parcel, USPS or courier 22.2 4.1 27.2 0.2 28.4 0.8 12.4
All other multiple modes S S S S S S 27.5
Other and unknown modes 49.2 1.5 31.7 0.2 45.3 0.3 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 28.5 – S S 17.8 – 27.0
Single modes 28.3 3.8 S S 17.8 0.3 48.2
Truck 28.2 4.6 S S 16.5 2.9 49.7
Rail 45.1 1.5 40.1 3.1 46.8 3.0 30.6
All other Single modes 37.6 1.1 S S S S 14.8
Multiple modes S S 42.6 0.1 35.0 0.2 27.1
Parcel, USPS or courier S S 48.0 0.1 39.2 0.2 27.1
All other multiple modes S S S S S S 31.6
Other and unknown modes 34.9 0.1 S S 37.8 0.2 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 17.2 – 26.3 – 25.1 – S
Single modes 19.3 6.1 27.4 6.6 25.2 5.0 S
Truck 24.5 7.5 30.6 5.8 30.1 8.6 S
Rail 24.2 2.6 34.5 6.0 35.3 9.1 18.9
All other Single modes 48.5 5.7 48.1 1.9 S S 16.8
Multiple modes 29.2 6.4 35.3 6.2 46.8 5.1 23.2
Parcel, USPS or courier 29.9 6.3 44.6 6.5 S S 23.2
All other multiple modes S S S S S S 29.7
Other and unknown modes S S S S S S 44.7

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 7.3 – S S S S 23.0
Single modes 10.5 4.3 S S S S 25.8
Truck 10.4 4.8 28.5 19.0 S S 26.9
Rail S S S S S S 31.6
All other Single modes S S S S S S 26.4
Multiple modes 23.3 4.0 26.0 2.4 39.3 4.4 24.5
Parcel, USPS or courier 23.3 4.0 26.0 2.4 39.3 4.4 24.5
All other multiple modes – – – – – – –
Other and unknown modes 46.2 0.5 46.3 0.8 49.9 0.1 39.2

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 43.8 – S S 43.9 – S
Single modes 50.0 14.1 S S 45.1 14.6 48.3
Truck 50.0 14.1 S S 45.1 14.6 48.3
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S S
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.