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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 8.9 – 11.9 – 14.9 – 14.3
Single modes 9.2 1.3 12.1 0.5 15.4 0.8 36.2
Truck 9.9 1.7 12.2 0.6 16.0 1.5 36.8
Rail 39.7 0.1 38.8 0.4 36.0 1.0 32.9
All other Single modes 30.1 1.1 32.2 – 29.7 – 11.2
Multiple modes 14.7 1.1 25.6 – 28.8 0.7 4.7
Parcel, USPS or courier 14.7 1.1 25.8 – 29.3 0.7 4.7
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S 35.5 0.4 23.3

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 21.1 – 23.5 – 14.3 – S
Single modes 20.9 2.0 22.1 3.8 13.4 4.8 S
Truck 20.9 2.0 22.1 3.8 13.4 4.8 S
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
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 28.4 – 16.5 – 31.2 – S
Single modes 28.4 – 16.5 – 31.2 – S
Truck 31.9 5.4 14.3 5.0 39.6 9.5 S
Rail 43.4 5.4 44.9 5.0 48.3 9.5 27.5
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 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 14.2 – 11.7 – 18.2 – 16.7
Single modes 14.2 0.1 11.7 0.1 18.2 0.2 16.8
Truck 14.2 0.1 11.7 0.1 18.2 0.2 16.8
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
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 25.2 – 24.1 – 39.3 – 23.2
Single modes 25.2 0.1 24.1 – 39.3 – 21.8
Truck 25.2 0.1 24.1 – 39.3 – 21.8
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 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 26.2 – 27.5 – 37.0 – 43.4
Single modes 26.2 0.3 27.7 0.3 37.5 2.0 S
Truck 28.0 3.5 27.8 0.4 38.2 3.6 S
Rail S S S S S S 31.6
All other Single modes S S 44.3 0.2 S S 17.2
Multiple modes 33.1 0.3 42.5 0.1 S S 6.8
Parcel, USPS or courier 33.1 0.3 42.5 0.1 S S 6.8
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S S

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 15.2 – S S 22.9 – 16.9
Single modes 16.1 1.9 S S 23.4 0.9 21.4
Truck 16.3 2.1 S S 24.7 2.4 21.7
Rail S S 46.4 0.9 47.9 2.2 26.4
All other Single modes S S S S S S 26.0
Multiple modes 35.0 1.7 40.1 0.2 S S 15.6
Parcel, USPS or courier 35.7 1.7 41.4 0.2 S S 15.7
All other multiple modes S S S S S S 31.6
Other and unknown modes 31.8 0.6 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 45.0 – 36.8 – 38.2 – S
Single modes 47.9 4.9 36.9 1.3 38.4 0.3 S
Truck 48.0 4.9 36.9 1.3 38.4 0.3 S
Rail – – – – – – –
All other Single modes S S S S S S 16.7
Multiple modes S S S S 23.4 0.3 S
Parcel, USPS or courier S S S S 23.4 0.3 S
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 29.8

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 30.0 – 21.8 – 27.7 – 18.2
Single modes 29.9 4.6 22.7 2.6 29.5 2.6 42.2
Truck 30.6 4.6 23.3 2.9 30.0 3.4 44.1
Rail – – – – – – –
All other Single modes 26.9 1.8 42.8 1.4 33.0 1.6 17.3
Multiple modes 27.6 5.0 S S S S 6.1
Parcel, USPS or courier 27.6 5.0 S S S S 6.1
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 44.9

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 22.1 – 39.9 – 32.7 – 10.0
Single modes 24.7 5.4 40.1 0.5 33.2 1.9 35.6
Truck 24.8 5.4 40.7 1.3 34.3 3.9 35.3
Rail S S S S S S 28.5
All other Single modes S S S S S S 30.5
Multiple modes 19.3 5.2 23.5 0.4 22.1 1.8 5.9
Parcel, USPS or courier 19.3 5.2 23.5 0.4 22.1 1.8 5.9
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 31.5

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 43.9 – 46.1 – 38.6 – S
Single modes 43.6 10.3 46.1 10.5 38.7 10.5 S
Truck 47.1 11.9 46.2 10.7 39.0 13.0 S
Rail – – – – – – –
All other Single modes S S S S S S 32.1
Multiple modes S S S S S S 30.6
Parcel, USPS or courier S S S S S S 30.6
All other multiple modes – – – – – – –
Other and unknown modes – – – – – – –

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.