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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 12.4 – 24.2 – 20.1 – 13.0
Single modes 11.7 4.1 24.6 0.6 21.2 1.8 23.4
Truck 11.9 4.2 25.2 1.3 22.8 3.1 25.9
Rail 26.1 0.3 23.8 1.0 18.2 1.8 18.6
All other Single modes 43.2 0.6 S S S S 8.6
Multiple modes 22.5 2.6 29.3 0.4 25.6 1.3 10.6
Parcel, USPS or courier 23.3 2.6 45.0 0.3 37.7 0.6 10.6
All other multiple modes 28.1 0.1 46.5 0.2 29.3 1.2 46.2
Other and unknown modes S S 30.4 0.4 S S 43.3

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 34.2 – 38.2 – 34.5 – 27.0
Single modes 39.8 9.5 40.8 4.6 38.6 6.3 23.1
Truck 39.9 9.5 40.9 4.6 38.6 6.3 23.0
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 26.8
Parcel, USPS or courier S S S S S S 28.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 31.6

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 20.6 – 12.9 – 16.2 – 21.0
Single modes 21.9 4.7 13.2 1.0 15.5 3.2 34.6
Truck 23.9 6.3 14.1 2.6 15.7 7.4 30.0
Rail 45.8 3.6 46.6 1.8 47.7 4.8 26.0
All other Single modes S S S S S S 31.6
Multiple modes S S 43.3 1.1 37.1 3.2 48.2
Parcel, USPS or courier S S S S S S 23.7
All other multiple modes 41.5 0.5 40.9 0.8 40.3 3.2 24.0
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 S S S S S S 27.9
Single modes S S S S S S 28.1
Truck S S S S S S 27.1
Rail 41.8 6.4 41.8 4.7 41.8 10.3 25.8
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 28.0

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 37.7 – 39.1 – 36.3 – 32.9
Single modes 37.6 0.1 39.0 0.1 36.2 – 33.7
Truck 37.6 0.1 39.0 0.1 36.2 – 33.7
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 31.2
Parcel, USPS or courier S S S S S S 31.2
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 31.5 – 47.4 – S S 15.4
Single modes 33.8 2.8 49.0 5.3 S S 17.1
Truck 35.4 4.0 49.3 5.4 S S 17.3
Rail S S S S S S 29.3
All other Single modes S S S S S S 24.8
Multiple modes 44.3 2.6 46.4 3.9 S S 20.4
Parcel, USPS or courier 45.1 1.9 48.7 0.9 47.2 1.2 20.0
All other multiple modes S S S S S S 30.4
Other and unknown modes 40.5 1.8 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 47.1 – 10.1 – 18.4 – 7.4
Single modes 9.8 11.9 11.3 5.4 19.2 9.4 30.7
Truck 9.7 11.8 10.7 5.1 18.7 9.1 19.7
Rail S S S S S S 30.8
All other Single modes S S S S S S 28.0
Multiple modes 15.4 5.0 48.6 4.5 47.7 7.3 5.2
Parcel, USPS or courier 17.3 4.6 27.4 0.8 28.6 1.1 5.2
All other multiple modes S S S S S S S
Other and unknown modes S S 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 18.4 – 40.2 – 33.0 – 26.7
Single modes 16.5 2.9 40.5 1.2 34.9 2.9 23.7
Truck 16.4 2.9 40.5 1.2 35.2 3.1 28.7
Rail S S S S S S 31.2
All other Single modes 47.3 1.0 S S S S 14.5
Multiple modes 38.8 2.8 45.2 0.5 48.6 2.8 18.3
Parcel, USPS or courier 39.2 2.8 46.2 0.5 S S 18.4
All other multiple modes S S 47.8 0.1 42.4 1.3 43.8
Other and unknown modes 48.4 0.3 S S S S 26.4

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 8.4 – 20.4 – 28.1 – 48.0
Single modes 11.8 6.6 21.0 1.4 29.4 2.6 S
Truck 13.1 6.8 17.8 5.7 32.8 8.0 S
Rail 46.7 1.9 43.4 6.3 43.1 8.8 26.0
All other Single modes 32.6 0.7 28.5 – 28.8 0.3 3.5
Multiple modes 34.7 6.6 23.0 0.9 31.0 2.6 25.8
Parcel, USPS or courier 34.8 6.7 29.0 1.0 36.8 2.2 25.9
All other multiple modes S S S S S S 31.9
Other and unknown modes S S S S S S 26.4

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 14.4 – 25.3 – 13.4 – 24.0
Single modes 14.6 0.7 25.7 0.9 13.7 0.8 17.5
Truck 14.6 0.7 24.8 1.0 12.0 1.9 17.8
Rail S S S S S S 36.1
All other Single modes S S 37.7 – 42.0 – 14.8
Multiple modes 22.3 0.6 29.2 0.3 45.2 0.8 17.9
Parcel, USPS or courier 24.3 0.5 27.6 0.2 30.7 0.3 18.0
All other multiple modes S S S S S S 31.0
Other and unknown modes S S S S S S 29.4

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 34.4 – 42.8 – S S 27.1
Single modes 40.4 9.4 43.0 2.3 S S 24.5
Truck 40.5 9.4 43.0 2.3 S S 21.7
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 27.3
Parcel, USPS or courier S S S S S S 27.3
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.