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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

Monday, July 2, 2012

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 6.8 – 18.1 – 29.6 – 24.3
Single modes 5.7 4.0 17.7 5.4 34.1 7.2 17.2
Truck 5.2 4.0 16.8 5.5 31.1 7.2 18.0
Rail 30.0 0.7 S S S S 45.4
All other Single modes 23.0 0.1 S S 47.3 – 14.8
Multiple modes 30.4 3.9 S S S S 9.2
Parcel, USPS or courier 34.4 4.1 27.6 0.1 24.6 0.6 9.1
All other multiple modes S S S S S S 30.4
Other and unknown modes 25.9 0.8 S S 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 30.8 – S S S S 22.1
Single modes 30.8 – S S S S 22.1
Truck 30.5 1.7 S S S S 22.9
Rail S S S S S S 31.6
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 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 26.6 – 31.5 – 35.9 – 24.2
Single modes 27.2 2.2 31.6 0.6 36.2 1.0 23.7
Truck 29.4 5.9 26.3 6.0 36.2 9.5 25.2
Rail 31.6 4.6 S S S S S
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.2
Parcel, USPS or courier S S S S S S 29.2
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 31.2

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 48.8 – 43.7 – 40.5
Single modes S S 49.1 1.0 34.9 8.6 26.7
Truck S S 49.1 1.0 34.9 8.6 26.7
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 S S S S S S 31.6
Other and unknown modes S S S S S S 31.8

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 23.5
Single modes 44.9 7.8 41.4 7.6 S S 23.5
Truck 44.9 7.8 41.4 7.6 S S 23.5
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S 31.6
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 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 25.7 – S S 37.3 – 29.3
Single modes 25.4 0.8 S S 37.2 0.6 43.5
Truck 25.1 2.2 S S 42.0 7.6 45.2
Rail 33.2 2.0 S S 33.7 7.8 26.3
All other Single modes S S S S S S S
Multiple modes 37.4 0.8 31.4 0.2 47.7 0.6 24.5
Parcel, USPS or courier 37.4 0.8 31.4 0.2 47.7 0.6 24.5
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 44.8

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 25.8 – 17.3 – 18.7 – 17.3
Single modes 27.1 6.7 19.0 3.3 20.1 4.0 25.3
Truck 27.2 6.7 19.0 3.2 20.1 4.0 26.5
Rail – – – – – – –
All other Single modes S S S S S S 22.3
Multiple modes 40.6 6.8 S S S S 15.0
Parcel, USPS or courier 40.6 6.8 S S S S 15.0
All other multiple modes – – – – – – –
Other and unknown modes 35.4 2.0 34.5 1.7 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 13.4 – 30.8 – 41.5 – 36.3
Single modes 13.2 2.6 30.7 0.2 40.0 1.0 S
Truck 13.2 2.7 27.7 3.9 21.7 9.8 S
Rail S S S S S S 31.2
All other Single modes 49.0 0.5 S S S S 30.1
Multiple modes 43.0 2.6 S S 32.2 0.5 37.1
Parcel, USPS or courier 43.0 2.6 S S 32.2 0.5 37.1
All other multiple modes – – – – – – –
Other and unknown modes S S 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 28.5 – 47.8 – 49.9 – 45.0
Single modes 32.3 11.2 48.4 7.7 S S S
Truck 33.0 11.3 48.5 7.8 S S S
Rail – – – – – – –
All other Single modes S S 40.5 0.2 S S 34.2
Multiple modes 47.2 11.4 S S 38.6 11.0 14.8
Parcel, USPS or courier 47.2 11.4 S S 38.6 11.0 14.8
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 24.9 – S S S S 45.8
Single modes 31.5 9.5 49.2 13.3 S S 20.3
Truck 31.6 9.7 49.2 13.3 S S 20.5
Rail S S S S S S 31.6
All other Single modes S S S S S S 30.3
Multiple modes 40.7 10.1 S S S S 25.4
Parcel, USPS or courier 40.8 10.1 46.5 6.0 S S 25.6
All other multiple modes S S S S S S 31.6
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 S S S S 49.3 – 34.1
Single modes S S S S S S S
Truck S S S S S S S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.1
Parcel, USPS or courier S S S S S S 29.1
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S S

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.