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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 7.7 – 15.5 – 22.6 – 15.4
Single modes 9.7 2.7 16.1 2.5 24.7 3.3 21.0
Truck 9.4 2.4 19.9 5.0 11.4 4.2 31.5
Rail 21.9 2.0 27.3 5.1 33.1 6.3 8.1
All other Single modes 31.8 0.4 36.6 0.4 29.7 0.3 9.3
Multiple modes 17.8 2.8 30.2 0.6 34.8 3.4 9.2
Parcel, USPS or courier 19.1 2.5 39.9 – S S 9.4
All other multiple modes 29.0 0.5 33.1 0.6 38.4 3.3 45.5
Other and unknown modes 24.8 0.9 46.9 2.7 36.7 0.6 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 25.0 – 21.0 – 29.2 – 18.9
Single modes 24.2 8.4 18.6 5.2 34.2 8.4 S
Truck 30.1 10.1 21.6 8.8 35.1 9.7 S
Rail S S S S S S 25.2
All other Single modes S S 38.1 7.6 37.8 9.6 29.6
Multiple modes S S 46.0 4.2 S S 19.4
Parcel, USPS or courier S S S S S S 19.9
All other multiple modes S S S S S S 29.4
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 20.0 – 21.6 – 33.7 – 39.9
Single modes 20.9 2.1 22.6 5.0 34.0 0.6 S
Truck 20.7 2.1 23.4 5.2 40.1 10.0 S
Rail 25.8 1.7 27.5 2.3 22.9 10.5 12.1
All other Single modes S S S S S S 30.3
Multiple modes S S S S S S 22.5
Parcel, USPS or courier S S S S S S 22.5
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 32.2

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 28.0 – 27.4 – S S S
Single modes 24.7 3.8 28.3 2.5 S S S
Truck 26.6 3.5 30.4 4.3 S S S
Rail 42.7 2.9 41.1 4.2 46.8 7.3 28.1
All other Single modes – – – – – – –
Multiple modes S S S S S S 31.0
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 38.1
Other and unknown modes S S S S S S 31.3

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 47.6 – 33.8 – 45.2 – 46.6
Single modes 48.1 0.9 33.8 0.2 45.2 0.2 45.0
Truck 48.1 0.9 33.8 0.2 45.2 0.2 45.0
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 28.2

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 19.6 – 22.5 – 29.2 – S
Single modes 19.5 3.1 23.4 1.6 26.9 3.3 S
Truck 19.5 3.2 23.3 1.6 27.0 3.3 S
Rail S S S S S S 34.2
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 19.3
Parcel, USPS or courier S S 49.4 – S S 19.8
All other multiple modes S S S S S S 23.7
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 11.3 – 17.5 – 27.4 – 19.4
Single modes 13.6 2.7 21.8 6.1 30.3 5.1 22.6
Truck 14.9 5.4 13.7 5.7 16.3 4.0 34.1
Rail 22.8 5.4 30.9 6.0 34.4 7.1 8.8
All other Single modes S S S S S S 21.8
Multiple modes 24.7 1.8 38.0 1.7 45.9 5.2 15.6
Parcel, USPS or courier 33.3 1.3 38.5 – 28.5 – 18.0
All other multiple modes 35.4 1.3 38.8 1.7 46.3 5.2 S
Other and unknown modes 39.3 1.9 S S S S 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 14.3 – S S 33.3 – 46.7
Single modes 14.3 4.6 S S 35.6 5.6 S
Truck 14.7 4.1 S S 35.8 6.4 S
Rail 44.5 0.7 S S S S 25.8
All other Single modes S S S S 49.8 – 9.8
Multiple modes 44.4 4.4 34.2 0.7 45.5 5.5 14.6
Parcel, USPS or courier 45.9 4.6 41.4 0.3 S S 14.9
All other multiple modes S S S S S S 28.0
Other and unknown modes S S S S 42.8 0.4 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 19.3 – 21.7 – 31.0 – 15.8
Single modes 24.2 6.8 26.7 8.7 40.3 11.2 25.4
Truck 23.1 6.5 26.7 8.7 40.4 11.1 23.6
Rail – – – – – – –
All other Single modes S S S S S S 26.5
Multiple modes 33.9 7.5 44.8 4.8 47.3 6.4 11.4
Parcel, USPS or courier 33.9 7.5 45.7 4.8 48.9 6.4 11.4
All other multiple modes S S S S S S 31.6
Other and unknown modes 31.5 6.2 34.6 9.3 S S 35.3

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 14.5 – 18.8 – 12.7 – 13.8
Single modes 19.0 8.8 19.6 2.2 15.3 4.6 18.0
Truck 19.0 8.8 19.6 2.2 15.3 4.6 17.7
Rail – – – – – – –
All other Single modes S S S S S S 28.1
Multiple modes 34.9 8.8 30.6 1.9 33.4 4.6 10.5
Parcel, USPS or courier 34.8 8.7 30.9 1.4 34.6 3.5 10.5
All other multiple modes S S S S S S 28.6
Other and unknown modes S S S S S S 37.9

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 S S S S S
Single modes S S 46.3 8.7 S S S
Truck S S 34.3 17.9 S S S
Rail S S S S S S 31.6
All other Single modes – – – – – – –
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 31.7

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.