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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 6.1 – 19.9 – 11.6 – 17.4
Single modes 7.4 2.2 20.3 1.1 12.4 1.6 22.2
Truck 8.2 2.8 25.3 5.0 9.5 4.5 23.1
Rail 18.1 0.8 22.3 3.9 28.2 4.9 8.3
All other Single modes 43.8 0.6 33.2 1.1 16.0 2.2 6.8
Multiple modes 19.4 2.1 32.8 0.3 25.3 1.1 8.8
Parcel, USPS or courier 15.4 1.3 16.7 – 17.2 0.1 8.9
All other multiple modes 37.3 1.1 36.2 0.3 27.4 1.0 12.2
Other and unknown modes 32.8 2.1 26.2 1.1 32.0 1.4 38.2

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 23.8 – 29.5 – 29.1 – S
Single modes 23.7 0.6 30.7 4.0 30.4 5.6 S
Truck 29.6 7.7 30.9 5.0 25.1 1.3 S
Rail 36.6 6.9 41.2 8.9 37.0 9.3 6.7
All other Single modes 19.9 4.8 20.1 5.6 22.7 8.3 16.2
Multiple modes 48.5 0.1 S S S S 25.8
Parcel, USPS or courier – – – – – – –
All other multiple modes 48.5 0.1 S S S S 25.8
Other and unknown modes S S S S S S 40.6

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 24.8 – 24.9 – 24.0 – S
Single modes 24.8 0.1 24.9 0.3 22.6 1.7 S
Truck 26.0 1.2 28.1 6.3 29.6 7.6 S
Rail 19.9 1.1 24.6 6.2 29.8 7.5 21.1
All other Single modes – – – – – – –
Multiple modes S S S S S S 30.7
Parcel, USPS or courier – – – – – – –
All other multiple modes S S S S S S 30.7
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 28.1 – 42.1 – 29.9 – S
Single modes 30.0 5.3 42.1 0.4 30.5 1.2 S
Truck 30.6 6.5 44.0 4.7 33.4 9.9 S
Rail – – – – – – –
All other Single modes 37.7 2.2 38.3 4.6 42.7 8.8 S
Multiple modes S S S S S S 37.9
Parcel, USPS or courier S S S S S S 45.9
All other multiple modes S S S S S S 29.8
Other and unknown modes S S S S S S S

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 37.1 – 22.0 – 32.3 – 41.3
Single modes 39.4 4.8 23.9 4.9 33.2 9.4 43.1
Truck 36.8 6.6 33.8 10.1 49.3 11.7 43.3
Rail 30.3 3.7 31.3 9.6 30.6 9.8 26.1
All other Single modes S S S S S S S
Multiple modes S S S S S S 30.4
Parcel, USPS or courier S S S S S S 30.1
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 43.8 3.0 S S 42.1

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 20.7 – 27.4 – 22.8 – 28.7
Single modes 24.9 7.2 27.7 0.8 23.6 1.7 40.3
Truck 25.4 7.0 32.9 7.9 28.2 7.7 41.0
Rail S S S S S S 28.3
All other Single modes 43.5 0.6 S S S S 28.9
Multiple modes 37.3 7.3 19.2 0.7 25.6 1.7 24.9
Parcel, USPS or courier 38.0 7.2 23.4 0.5 27.7 0.4 25.0
All other multiple modes S S S S 49.0 1.4 26.2
Other and unknown modes 30.4 0.2 S S 48.1 0.6 33.5

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 17.9 – 27.2 – 25.0 – 17.1
Single modes 18.9 3.9 27.7 1.6 24.3 6.5 36.5
Truck 19.0 3.8 28.0 1.6 25.1 6.1 40.9
Rail 37.5 0.3 27.4 0.5 35.6 1.1 23.3
All other Single modes 47.7 – S S 49.8 – 21.6
Multiple modes 30.7 3.8 S S S S 7.1
Parcel, USPS or courier 29.1 3.6 29.4 0.5 32.4 1.9 7.0
All other multiple modes S S S S S S 27.2
Other and unknown modes S S S S S S 36.3

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 21.1 – 28.2 – 17.7 – 22.9
Single modes 21.2 1.3 27.7 0.6 18.6 3.1 33.4
Truck 21.8 2.0 28.5 1.1 20.6 4.4 33.9
Rail 25.5 1.2 21.5 1.1 22.2 2.9 24.7
All other Single modes 46.2 0.1 42.2 – 29.5 – 17.5
Multiple modes 30.0 1.1 28.4 0.3 42.6 1.7 14.7
Parcel, USPS or courier 30.0 1.1 32.0 – 32.9 0.3 14.8
All other multiple modes S S S S S S 21.8
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 10.2 – 19.3 – 23.3 – 14.8
Single modes 17.0 6.2 20.8 4.3 28.5 6.3 S
Truck 19.2 7.1 21.6 5.2 32.6 8.0 S
Rail 49.2 1.7 S S 48.6 5.9 21.0
All other Single modes S S 30.9 – 31.4 0.1 7.9
Multiple modes 29.1 6.6 29.4 4.0 25.9 7.0 8.4
Parcel, USPS or courier 23.0 3.3 28.6 0.8 33.3 1.0 8.5
All other multiple modes 42.2 3.6 29.8 3.2 25.4 6.3 16.5
Other and unknown modes 38.0 5.6 44.7 3.7 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 21.4 – 22.0 – 26.1 – 20.8
Single modes 22.4 2.4 21.3 2.1 23.5 4.6 30.6
Truck 22.5 2.5 21.4 4.3 24.8 7.5 27.8
Rail 36.6 0.3 39.4 3.2 S S 30.0
All other Single modes S S S S S S 21.1
Multiple modes 23.4 1.7 S S S S 7.9
Parcel, USPS or courier 26.2 1.6 S S S S 7.9
All other multiple modes S S S S S S 30.2
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 39.6 – 28.1 – 31.6 – S
Single modes 40.8 9.6 34.4 11.4 38.3 10.2 S
Truck 41.0 9.1 34.4 11.4 38.3 10.2 S
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 41.1
Parcel, USPS or courier S S S S S S 41.1
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.