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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 8.6 – 10.4 – 19.7 – 8.6
Single modes 9.7 1.4 10.5 1.6 19.9 0.3 13.5
Truck 10.0 2.7 9.4 5.3 12.3 6.0 14.4
Rail 26.6 2.2 30.6 4.9 32.7 5.6 15.8
All other Single modes 33.5 0.5 S S S S 11.3
Multiple modes 11.3 0.8 15.5 – 11.7 0.1 16.6
Parcel, USPS or courier 11.8 0.8 25.5 – 23.0 – 16.6
All other multiple modes 20.6 – 20.6 – 21.5 0.1 21.3
Other and unknown modes 26.3 1.0 S S 23.1 0.2 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 21.5 – 40.2 – 43.4 – S
Single modes 21.4 1.5 39.6 2.0 43.4 0.1 S
Truck 21.1 3.4 43.9 8.2 36.8 13.8 S
Rail S S S S S S 27.3
All other Single modes S S S S S S 31.6
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 30.9

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 14.2 – 29.7 – 25.3 – S
Single modes 14.0 1.6 25.6 2.6 25.1 0.3 S
Truck 15.3 3.5 23.9 5.6 28.0 9.3 S
Rail 48.3 2.6 S S 46.9 9.4 26.9
All other Single modes – – – – – – –
Multiple modes S S S S 41.8 0.3 33.0
Parcel, USPS or courier S S S S 41.8 0.3 33.0
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 30.9

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 19.1 – 31.4 – 45.4 – 15.3
Single modes 19.1 – 31.4 – 45.4 – 15.3
Truck 22.2 7.9 24.8 9.6 21.8 17.5 20.6
Rail S S S S S S 37.5
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 31.6

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 26.1 – 23.9 – 21.7 – 34.6
Single modes 26.4 0.9 23.9 0.1 21.8 0.2 35.2
Truck 27.7 7.3 29.4 9.7 33.0 13.5 36.9
Rail 22.3 3.9 27.0 8.9 30.7 13.4 15.5
All other Single modes S S S S S S 30.4
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 29.0

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 12.3 – 30.5 – 41.2 – 19.5
Single modes 12.9 1.1 30.8 0.6 41.8 0.9 20.7
Truck 14.8 2.9 33.9 5.7 39.6 7.3 20.7
Rail 26.4 2.8 29.5 5.6 S S 17.3
All other Single modes 30.7 0.2 46.7 1.4 44.0 1.7 34.1
Multiple modes 25.2 1.0 19.2 0.2 22.2 0.7 21.1
Parcel, USPS or courier 42.2 1.0 S S S S 14.7
All other multiple modes 26.0 0.6 26.4 0.2 25.8 0.7 18.8
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 30.9 – 22.5 – 13.7 – 8.2
Single modes 30.9 0.8 22.5 – 13.7 0.1 7.9
Truck 33.7 2.8 26.7 3.6 12.6 3.4 8.6
Rail 13.7 2.8 18.4 3.6 17.9 3.4 4.2
All other Single modes 41.8 – S S 46.6 – 22.7
Multiple modes S S 40.8 – S S 14.8
Parcel, USPS or courier 49.6 0.5 29.7 – 29.6 – 14.9
All other multiple modes S S S S S S 29.4
Other and unknown modes 25.2 0.4 49.5 – 37.5 – 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 38.6 – S S S S 15.6
Single modes 42.0 3.5 S S S S 17.3
Truck 30.6 4.5 S S S S 18.3
Rail S S S S S S 14.0
All other Single modes 43.1 0.8 S S S S 18.4
Multiple modes 36.0 2.4 27.1 0.3 23.7 0.8 30.5
Parcel, USPS or courier 37.4 2.4 31.8 0.3 36.7 0.3 23.6
All other multiple modes 40.2 0.2 41.6 0.1 38.7 0.8 45.5
Other and unknown modes 37.8 2.6 S S 37.9 1.6 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 12.5 – 18.0 – 15.8 – 28.8
Single modes 17.3 7.1 18.0 7.1 17.6 3.3 28.1
Truck 12.4 6.3 21.1 9.1 15.4 8.6 33.9
Rail 47.8 6.4 47.8 5.0 49.4 7.2 26.0
All other Single modes 49.7 2.3 S S S S 7.2
Multiple modes 35.1 5.6 S S S S 24.1
Parcel, USPS or courier 35.3 5.7 S S S S 24.1
All other multiple modes S S S S S S 29.9
Other and unknown modes 45.7 5.8 S S 42.3 3.3 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 11.3 – 35.4 – 12.8 – 8.7
Single modes 11.0 2.2 32.4 3.0 13.2 1.1 17.2
Truck 10.8 2.2 32.4 3.0 13.3 1.1 35.9
Rail S S S S S S 41.4
All other Single modes S S 40.9 – 47.4 0.1 26.7
Multiple modes 30.1 1.3 22.7 0.3 31.3 0.6 10.7
Parcel, USPS or courier 30.1 1.3 23.2 0.3 22.0 0.5 10.7
All other multiple modes S S S S S S 31.6
Other and unknown modes 41.0 1.8 S S 41.9 1.1 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 24.6 – 28.1 – 32.2 – 32.8
Single modes 25.1 1.8 28.1 0.4 32.3 0.5 24.3
Truck 25.1 1.8 28.1 0.4 32.3 0.5 24.3
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes 42.4 1.8 49.7 0.4 42.2 0.5 S
Parcel, USPS or courier 42.4 1.8 49.7 0.4 42.2 0.5 S
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.