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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 8.7 – 14.3 – 8.9 – 11.0
Single modes 8.7 2.2 15.1 2.1 5.7 2.7 29.0
Truck 9.0 2.0 23.1 7.3 17.7 8.1 21.1
Rail 26.9 0.9 25.7 6.7 23.0 7.5 11.2
All other Single modes 48.2 0.5 31.5 3.3 35.1 6.0 7.0
Multiple modes 16.7 1.9 S S S S 5.3
Parcel, USPS or courier 17.7 1.9 45.0 0.2 S S 5.3
All other multiple modes 23.0 0.2 S S S S 13.6
Other and unknown modes 25.0 0.5 S S 26.4 0.1 49.7

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 29.0 – 34.6 – 30.7 – S
Single modes 29.4 1.2 34.7 1.2 30.8 0.9 S
Truck 32.6 6.7 40.2 12.4 44.1 13.5 S
Rail S S S S S S 28.9
All other Single modes S S S S S S 18.5
Multiple modes S S S S S S 37.7
Parcel, USPS or courier S S S S S S 37.7
All other multiple modes – – – – – – –
Other and unknown modes 48.9 1.2 45.2 1.2 S S 27.5

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 24.3 – 37.1 – 31.4 – S
Single modes 24.9 2.0 38.9 5.6 33.4 5.3 S
Truck 27.0 4.7 46.2 9.5 40.7 10.4 S
Rail 43.1 4.5 S S S S 26.1
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 30.3
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 – – – – – – –

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 18.6 – 27.9 – 30.8 – S
Single modes 20.3 4.2 30.2 5.1 27.5 5.9 S
Truck 27.3 11.0 42.5 13.2 40.5 17.3 40.9
Rail 35.9 6.2 45.8 6.3 46.8 9.3 19.3
All other Single modes 45.0 4.6 45.4 6.8 46.5 11.6 26.3
Multiple modes S S S S S S 23.5
Parcel, USPS or courier 48.9 0.3 44.3 – 48.0 – 24.1
All other multiple modes S S S S S S 30.1
Other and unknown modes S S S S S S 38.2

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 45.9 – 43.3 – S S S
Single modes 45.9 10.5 43.3 10.5 S S S
Truck 45.9 10.5 43.3 10.5 S S S
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 – – – – – – –
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 18.6 – 35.9 – 24.8 – 13.0
Single modes 24.2 8.1 36.2 6.1 25.2 9.0 16.6
Truck 24.9 7.9 39.5 8.0 30.5 11.2 14.6
Rail S S S S S S 27.0
All other Single modes 45.1 – 43.5 – 36.3 – 23.4
Multiple modes 34.7 8.1 30.1 5.5 27.4 8.9 12.7
Parcel, USPS or courier 34.7 8.1 30.2 5.5 27.5 8.9 12.7
All other multiple modes S S S S S S 31.6
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 9.8 – 26.1 – 18.3 – 7.9
Single modes 14.2 6.8 29.9 7.5 27.7 8.9 21.9
Truck 15.6 7.1 34.9 9.6 24.8 10.4 18.7
Rail S S S S S S 29.9
All other Single modes 45.5 0.1 S S S S 21.9
Multiple modes 23.2 7.0 42.5 4.5 39.2 9.0 3.5
Parcel, USPS or courier 25.4 7.5 S S S S 3.6
All other multiple modes 49.4 1.0 S S S S 24.3
Other and unknown modes 31.3 0.8 S S 31.9 0.6 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 14.4 – 23.8 – 24.7 – 30.8
Single modes 13.9 2.7 24.2 1.6 24.8 0.9 S
Truck 15.2 3.7 31.0 7.4 38.5 8.4 S
Rail 11.9 0.6 21.8 2.6 22.5 3.8 35.5
All other Single modes 37.7 2.7 41.4 7.7 40.9 9.5 17.2
Multiple modes 50.0 1.6 45.3 0.4 48.6 0.7 12.4
Parcel, USPS or courier S S S S S S 12.4
All other multiple modes S S S S S S 30.1
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 10.0 – 19.0 – 24.0 – 23.0
Single modes 11.5 2.9 19.9 1.2 24.8 1.1 43.0
Truck 11.9 3.5 20.0 1.2 25.0 1.4 36.1
Rail S S S S S S 31.6
All other Single modes S S S S S S 8.7
Multiple modes 28.2 3.1 32.0 0.3 36.8 0.5 15.5
Parcel, USPS or courier 28.7 3.2 37.6 0.3 44.7 0.4 15.5
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 36.9 1.1 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 12.7 – S S S S 14.3
Single modes 10.7 4.0 S S S S 22.0
Truck 10.9 4.1 15.6 14.4 13.2 13.8 22.4
Rail S S S S S S S
All other Single modes S S S S S S 25.6
Multiple modes S S 34.1 0.8 37.4 2.3 7.1
Parcel, USPS or courier S S S S S S 7.4
All other multiple modes 50.0 0.4 S S S S 46.3
Other and unknown modes S S 45.7 1.0 S S 48.9

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 49.9 – S S 17.1
Single modes S S S S S S 19.8
Truck S S S S S S 19.8
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.4
Parcel, USPS or courier S S S S S S 29.4
All other multiple modes – – – – – – –
Other and unknown modes – – – – – – –

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.