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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 7.6 – 11.4 – 17.7 – 9.5
Single modes 5.7 2.0 11.9 1.9 18.7 2.0 8.0
Truck 6.0 2.4 13.9 6.5 8.0 7.8 8.2
Rail 36.1 0.7 31.2 4.5 19.8 6.0 8.4
All other Single modes 27.0 0.6 S S S S 9.2
Multiple modes 24.0 2.4 31.6 0.4 34.3 1.4 4.6
Parcel, USPS or courier 20.3 2.1 19.9 0.1 23.1 0.3 4.8
All other multiple modes S S S S S S 34.9
Other and unknown modes 25.9 1.2 37.3 1.8 31.6 0.9 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 – 38.9 – S S 32.9
Single modes 22.2 1.7 38.9 – S S S
Truck 24.2 11.8 46.6 14.4 44.3 17.0 S
Rail S S S S S S 21.9
All other Single modes S S S S S S 27.6
Multiple modes S S S S S S 24.3
Parcel, USPS or courier S S S S S S 24.3
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 30.4

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 8.9 – 23.1 – 21.9 – 28.5
Single modes 9.2 0.7 23.0 0.2 22.1 1.1 37.7
Truck 9.2 0.7 23.1 0.3 22.5 1.6 34.7
Rail S S 43.0 0.3 44.6 1.3 25.9
All other Single modes S S S S S S 26.9
Multiple modes S S S S S S 17.4
Parcel, USPS or courier S S S S S S 19.9
All other multiple modes S S S S S S S
Other and unknown modes 45.4 0.2 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 30.7 – 16.3 – 32.2 – 36.0
Single modes 33.5 5.8 16.9 6.2 32.7 12.0 41.3
Truck 38.6 7.8 23.1 10.4 35.9 9.1 33.9
Rail 29.1 8.0 37.8 10.1 34.4 15.0 17.5
All other Single modes – – – – – – –
Multiple modes S S S S S S 28.3
Parcel, USPS or courier S S S S S S 28.3
All other multiple modes – – – – – – –
Other and unknown modes 37.5 5.4 40.6 6.2 48.4 12.0 35.6

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 43.8 – 45.0 – 43.1 – 23.6
Single modes 43.9 0.2 45.0 – 43.1 – 24.0
Truck 45.4 2.0 47.6 3.0 S S 25.4
Rail S S S S S S 29.1
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 31.7

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 9.9 – 37.7 – 34.1 – 15.1
Single modes 9.5 1.1 37.9 0.4 34.3 1.4 17.6
Truck 10.3 3.1 41.7 6.0 39.8 7.4 16.9
Rail S S S S S S 26.1
All other Single modes S S 48.8 0.1 S S 9.6
Multiple modes 25.1 1.2 26.0 0.3 33.1 1.1 31.7
Parcel, USPS or courier 25.1 1.1 26.1 0.3 38.0 1.1 31.9
All other multiple modes 37.9 – 36.0 – 40.1 – 44.0
Other and unknown modes S S 48.6 0.2 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 9.1 – 13.1 – 10.3 – 6.1
Single modes 6.5 5.0 14.0 2.1 11.0 2.6 14.2
Truck 6.5 5.1 15.2 2.8 11.8 3.1 12.3
Rail 20.0 0.4 18.6 1.5 13.7 1.3 14.0
All other Single modes S S S S S S 22.2
Multiple modes 36.9 5.1 46.3 1.7 46.9 2.8 4.7
Parcel, USPS or courier 38.4 5.1 38.2 0.6 40.0 0.9 4.8
All other multiple modes 41.1 0.4 S S S S 25.8
Other and unknown modes 38.3 0.6 S S 37.8 0.4 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 13.7 – S S 16.7 – 16.6
Single modes 11.1 3.9 S S 19.7 5.4 34.3
Truck 11.1 3.9 S S 19.8 5.4 35.7
Rail S S S S S S 31.6
All other Single modes 34.0 0.2 41.0 – 39.6 – 12.9
Multiple modes 23.5 2.2 23.9 0.5 32.4 1.0 9.4
Parcel, USPS or courier 22.7 2.3 23.8 0.3 26.5 0.4 9.4
All other multiple modes S S 41.9 0.3 S S 28.8
Other and unknown modes 41.3 2.5 39.0 4.6 48.0 5.6 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 35.3 – 46.0 – 27.9 – 18.4
Single modes 25.6 5.7 20.0 15.1 18.6 10.6 30.8
Truck 27.6 5.1 20.1 14.7 18.0 10.3 26.2
Rail S S S S S S 28.4
All other Single modes 24.5 1.4 20.0 – 24.5 0.1 15.3
Multiple modes S S S S S S 9.7
Parcel, USPS or courier 46.2 4.3 S S S S 9.7
All other multiple modes S S S S S S 27.7
Other and unknown modes 44.6 4.9 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 7.9 – 19.9 – 14.5 – 6.7
Single modes 7.9 4.0 20.6 1.3 16.1 2.6 16.7
Truck 8.0 4.0 21.0 2.6 16.6 3.5 16.6
Rail 37.1 – 35.3 1.8 43.4 1.8 26.6
All other Single modes 36.3 – 44.3 – S S 12.0
Multiple modes 28.1 4.6 29.9 0.8 29.8 2.6 5.2
Parcel, USPS or courier 28.4 4.6 31.5 0.8 33.6 2.7 5.2
All other multiple modes S S S S S S 29.8
Other and unknown modes S S S S 41.7 1.1 31.0

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 37.8 – 45.7
Single modes 34.3 12.4 S S 43.7 10.8 34.7
Truck 37.5 13.8 S S 44.2 10.7 37.1
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S S
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 31.3

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.