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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 16.6 – 18.8 – 23.6 – 10.9
Single modes 19.3 3.4 19.2 0.7 24.6 2.9 10.5
Truck 18.2 5.7 25.4 5.7 39.0 6.5 11.2
Rail 45.1 7.1 25.3 5.6 19.7 6.0 12.0
All other Single modes 31.1 – S S S S 13.6
Multiple modes 17.1 2.8 18.9 0.1 21.2 0.5 9.8
Parcel, USPS or courier 19.6 2.7 22.1 0.1 24.4 0.6 9.8
All other multiple modes 47.3 0.8 40.3 – 44.2 0.4 S
Other and unknown modes 47.6 1.9 40.4 0.7 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 31.1 – 35.0 – 35.7 – S
Single modes 31.2 0.5 35.1 0.2 35.7 – S
Truck 38.0 11.2 47.6 13.5 46.9 11.0 S
Rail 34.4 11.3 36.0 13.5 38.8 11.0 14.6
All other Single modes – – – – – – –
Multiple modes S S S S S S 31.6
Parcel, USPS or courier – – – – – – –
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 S S 28.3 – 35.6 – 36.7
Single modes S S 28.7 1.7 35.8 0.8 35.6
Truck S S 35.5 7.3 43.9 7.6 39.4
Rail S S 30.7 7.7 25.5 8.1 19.7
All other Single modes S S S S S S 31.6
Multiple modes S S 41.2 – 39.9 0.1 23.7
Parcel, USPS or courier S S 41.2 – 39.9 0.1 23.7
All other multiple modes – – – – – – –
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 21.3 – 21.5 – 31.0 – 22.3
Single modes 21.3 – 21.5 – 31.0 – 22.3
Truck 21.3 – 21.5 – 31.0 – 22.3
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 31.6
Parcel, USPS or courier – – – – – – –
All other multiple modes S S S S S S 31.6
Other and unknown modes – – – – – – –

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 S S S S S S 49.6
Single modes S S S S S S 49.6
Truck S S S S S S 49.6
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 – – – – – – –

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 14.8 – S S 41.8 – 17.9
Single modes 15.1 3.6 S S 44.8 4.9 25.7
Truck 15.1 3.6 S S 44.9 4.9 20.2
Rail – – – – – – –
All other Single modes S S S S S S 24.7
Multiple modes 39.1 3.7 S S S S 13.9
Parcel, USPS or courier 33.4 3.1 29.3 0.3 48.3 0.5 14.0
All other multiple modes S S S S S S 38.2
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 29.6 – 13.9 – 16.1 – 7.3
Single modes 29.1 10.5 12.8 3.9 15.7 6.8 12.6
Truck 29.2 10.3 12.8 3.9 15.2 6.5 11.4
Rail S S S S S S 31.8
All other Single modes S S S S S S 28.5
Multiple modes 40.8 11.7 40.7 2.6 39.6 7.0 4.5
Parcel, USPS or courier 40.8 11.8 44.2 2.6 41.2 7.2 4.5
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 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 15.2 – 47.5 – S S 14.0
Single modes 17.0 9.6 48.1 1.6 S S 17.1
Truck 17.1 9.6 48.2 1.6 S S 17.8
Rail S S S S S S 31.6
All other Single modes S S S S S S 23.5
Multiple modes S S S S 49.6 1.9 20.0
Parcel, USPS or courier S S S S 49.6 1.9 20.0
All other multiple modes – – – – – – –
Other and unknown modes S S 46.1 0.9 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 39.6 – S S S S 13.5
Single modes 44.4 11.7 S S S S 14.8
Truck 19.2 7.2 S S S S 12.9
Rail S S S S 44.7 14.2 25.2
All other Single modes S S S S S S 24.9
Multiple modes 27.4 8.8 25.6 5.9 26.7 8.6 16.7
Parcel, USPS or courier 28.9 8.4 28.5 5.6 26.7 8.6 16.7
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 39.4

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 44.0 – S S S S 12.9
Single modes S S S S S S 21.1
Truck S S 26.4 16.1 28.9 12.7 20.0
Rail 45.2 2.1 S S S S S
All other Single modes S S 42.6 – 44.2 0.1 24.6
Multiple modes 30.8 7.2 26.9 3.9 40.2 8.7 11.0
Parcel, USPS or courier 33.7 5.4 27.5 1.8 39.6 2.1 10.8
All other multiple modes 41.2 3.0 41.7 2.2 44.5 7.6 26.9
Other and unknown modes S S 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 49.4 – 40.8 – S S S
Single modes S S 41.6 3.1 S S 47.6
Truck S S 43.1 11.9 S S 42.9
Rail S S S S S S 31.6
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.3
Parcel, USPS or courier S S S S S S 29.3
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.