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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 28.4 – 9.9 – 6.9 – 12.0
Single modes 33.6 4.5 10.5 1.4 10.5 5.2 9.0
Truck 13.0 8.1 11.9 2.7 11.5 3.8 11.5
Rail 17.3 0.2 20.6 0.7 18.9 3.9 8.5
All other Single modes S S S S 40.2 1.3 4.6
Multiple modes 18.7 4.3 20.0 0.8 23.1 4.9 10.9
Parcel, USPS or courier 19.0 4.1 20.4 0.2 33.3 0.8 11.2
All other multiple modes 28.9 0.4 22.4 0.6 23.3 4.4 3.7
Other and unknown modes 34.3 0.6 14.8 1.0 28.1 1.2 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 25.8 – 31.4 – 35.4 – S
Single modes 27.5 4.6 30.8 3.2 36.2 3.5 S
Truck 28.2 5.6 30.8 3.3 36.8 6.0 S
Rail – – – – – – –
All other Single modes S S S S S S 32.7
Multiple modes S S S S S S 24.1
Parcel, USPS or courier S S S S S S 31.3
All other multiple modes S S S S S S 23.6
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 20.6 – 23.0 – 22.4 – S
Single modes 21.5 2.0 24.1 2.8 22.9 1.6 33.0
Truck 21.5 2.0 24.1 2.8 23.0 1.6 40.6
Rail – – – – – – –
All other Single modes S S S S S S 26.4
Multiple modes S S 32.8 0.3 34.9 1.7 36.1
Parcel, USPS or courier S S S S S S 26.8
All other multiple modes 39.4 0.2 33.8 0.3 35.3 1.7 21.3
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 S S 17.8 – 42.1 – 29.7
Single modes S S 18.5 3.0 30.2 13.8 35.8
Truck S S 18.6 3.0 31.1 13.3 36.0
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 S S S S S S 31.6
Other and unknown modes 48.6 2.0 49.9 2.1 S S 28.7

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 32.3 – 28.2 – 32.4 – 14.4
Single modes 29.4 2.7 24.6 3.1 32.2 0.3 13.5
Truck 31.3 5.4 26.5 5.6 32.9 2.5 13.5
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 28.8

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 13.1 – S S 46.5 – S
Single modes 26.2 11.5 S S 49.3 18.5 18.4
Truck 26.2 11.5 S S 49.3 18.4 19.8
Rail – – – – – – –
All other Single modes 43.8 – S S S S 26.1
Multiple modes 34.0 11.7 S S 40.6 18.0 44.8
Parcel, USPS or courier 34.2 11.9 S S S S 43.9
All other multiple modes S S S S S S 30.3
Other and unknown modes S S 37.4 2.2 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 13.0 – 12.5 – 9.0 – 15.1
Single modes 15.9 5.1 13.7 5.6 13.3 8.1 29.6
Truck 16.9 5.1 14.7 5.2 14.7 3.7 32.6
Rail 19.5 1.1 17.2 4.2 16.4 7.7 8.0
All other Single modes S S S S S S 17.7
Multiple modes 18.4 4.2 S S S S 9.1
Parcel, USPS or courier 20.7 3.8 25.6 0.1 24.3 0.2 9.3
All other multiple modes 40.2 1.6 S S S S 11.6
Other and unknown modes 27.2 1.6 44.3 4.2 42.8 1.3 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 28.1 – 29.6 – 26.8 – 32.0
Single modes 32.0 5.3 31.2 3.1 31.6 7.1 28.7
Truck 32.8 5.5 32.9 4.2 18.9 9.3 28.7
Rail S S S S S S 30.3
All other Single modes S S S S S S 15.5
Multiple modes 33.9 4.0 39.1 0.8 S S 34.4
Parcel, USPS or courier 34.6 4.0 39.1 0.4 42.8 1.7 35.1
All other multiple modes S S S S S S 27.8
Other and unknown modes 33.2 1.8 47.9 3.0 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 47.6 – 19.1 – 27.6 – 37.2
Single modes S S 23.1 5.6 32.8 10.1 43.6
Truck 17.8 13.0 31.6 9.7 31.7 10.8 49.1
Rail – – – – – – –
All other Single modes S S 49.4 8.9 S S 5.9
Multiple modes 28.7 8.8 30.8 3.9 28.7 8.5 11.1
Parcel, USPS or courier 28.7 8.8 30.6 3.8 29.1 8.4 11.5
All other multiple modes 48.5 – 48.9 0.1 35.4 0.3 25.3
Other and unknown modes S S 45.3 4.0 S S 30.7

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 31.1 – 31.6 – 26.1 – 19.6
Single modes 37.7 7.8 33.8 5.4 23.9 9.3 11.3
Truck 38.1 7.7 33.9 5.4 22.3 8.7 10.5
Rail S S S S S S 29.3
All other Single modes 49.3 0.3 S S S S 22.9
Multiple modes 32.6 6.7 33.9 4.4 35.3 9.5 15.0
Parcel, USPS or courier 37.9 6.8 46.9 1.3 S S 15.4
All other multiple modes S S 42.1 4.7 42.4 13.1 12.2
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 S S 22.9
Single modes S S 48.8 13.3 S S S
Truck S S 48.8 13.3 S S S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 24.8
Parcel, USPS or courier S S S S S S 24.8
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 32.6

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.