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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 40.9 – 46.0 – 29.4 – 43.8
Single modes 42.7 3.5 45.7 1.0 33.8 12.5 27.9
Truck 42.7 3.5 45.7 1.0 33.8 12.5 30.7
Rail S S S S S S 31.6
All other Single modes S S S S S S 26.1
Multiple modes 29.7 3.0 40.0 1.0 S S 14.8
Parcel, USPS or courier 29.7 3.0 40.0 1.0 S S 14.8
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 21.0

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 48.5 – S S S S 32.4
Single modes S S S S S S 24.4
Truck S S S S S S 24.4
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 S S S S S S 29.9

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 23.1 – 27.4 – 29.2 – 38.0
Single modes 23.4 1.0 28.4 3.0 30.5 3.7 14.7
Truck 23.4 1.0 28.4 3.0 30.5 3.7 14.7
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 30.0

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 S S S S 31.6
Single modes S S S S S S 31.6
Truck S S S S S S 31.6
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
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 31.6
Single modes S S S S S S 31.6
Truck S S S S S S 31.6
Rail – – – – – – –
All other Single modes – – – – – – –
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 S S 42.0 – S S 37.4
Single modes S S 42.2 10.4 S S 38.1
Truck S S 42.2 10.4 S S 38.1
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 30.3
Parcel, USPS or courier S S S S S S 30.3
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 28.9

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 S S 38.9 – 41.6 – 28.0
Single modes S S 40.1 3.1 47.2 11.7 46.6
Truck S S 40.1 3.1 47.2 11.7 46.8
Rail – – – – – – –
All other Single modes S S S S S S 29.9
Multiple modes 45.6 6.8 S S S S 16.8
Parcel, USPS or courier 45.6 6.8 S S S S 16.8
All other multiple modes – – – – – – –
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 32.7 – S S S S S
Single modes 42.9 16.8 S S S S S
Truck 42.9 16.8 S S S S S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes 35.3 12.2 28.6 15.9 28.5 19.4 33.6
Parcel, USPS or courier 35.3 12.2 28.6 15.9 28.5 19.4 33.6
All other multiple modes – – – – – – –
Other and unknown modes 40.2 5.2 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 S S 43.8 – S S S
Single modes S S 46.2 11.2 S S S
Truck S S 46.2 11.2 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 S S 44.8 11.3 35.9 17.9 35.5
Parcel, USPS or courier S S 44.8 11.3 35.9 17.9 35.5
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 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 30.8 – 24.6 – 28.5 – 35.0
Single modes 34.1 10.8 25.5 12.0 34.8 13.2 S
Truck 35.3 11.8 25.5 14.1 35.1 15.8 22.8
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes 49.9 6.1 S S S S 27.0
Parcel, USPS or courier 49.9 6.1 S S S S 27.0
All other multiple modes – – – – – – –
Other and unknown modes S S 46.4 10.5 S S 23.7

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 S S S S S S S
Single modes S S S S S S 31.6
Truck S S S S S S 31.6
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 43.7
Parcel, USPS or courier S S S S S S 43.7
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.