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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 15.9 – 29.4 – 15.4 – 12.8
Single modes 17.2 3.0 29.6 0.6 15.7 1.5 15.5
Truck 17.4 4.2 29.6 0.5 16.1 1.4 13.2
Rail S S 48.1 0.2 39.9 1.0 30.1
All other Single modes 49.1 0.7 45.5 – 47.4 – 8.2
Multiple modes 31.8 2.9 27.1 0.5 26.7 1.4 7.7
Parcel, USPS or courier 34.4 2.9 22.6 – 22.7 0.1 7.7
All other multiple modes 37.4 0.3 42.2 0.5 36.7 1.4 26.4
Other and unknown modes 44.0 0.8 48.0 0.3 S S 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 43.5 – S S 44.5 – 25.6
Single modes 43.6 0.8 S S 44.6 0.2 25.2
Truck 43.6 0.8 S S 44.6 0.2 25.2
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 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 43.0 – 48.9 – 42.5 – 27.7
Single modes 43.0 – 48.9 – 42.5 – 27.7
Truck 43.0 – 48.9 – 42.5 – 27.7
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
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 36.9 – 36.8 – 38.2 – 24.6
Single modes 36.9 – 36.8 – 38.2 – 24.6
Truck 36.9 – 36.8 – 38.2 – 24.6
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 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 S S S S S S 25.5
Single modes S S S S S S 25.5
Truck S S S S S S 25.5
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes – – – – – – –

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 24.8 – 32.9 – 32.8 – 26.5
Single modes 25.0 1.4 33.0 0.2 32.1 0.7 37.5
Truck 25.1 1.4 33.0 0.2 32.3 0.7 37.3
Rail S S S S S S 30.8
All other Single modes 46.6 – S S S S 26.2
Multiple modes 44.7 1.4 S S S S 16.9
Parcel, USPS or courier S S 32.5 – 39.2 0.4 17.1
All other multiple modes S S S S S S 38.0
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 28.3 – 21.5 – 16.9 – 8.6
Single modes 29.1 2.3 21.5 0.2 17.0 0.4 9.4
Truck 29.1 2.4 21.5 0.2 16.9 0.4 11.1
Rail – – – – – – –
All other Single modes S S S S S S 21.7
Multiple modes 35.3 2.4 32.9 0.1 27.9 0.4 8.6
Parcel, USPS or courier 35.3 2.4 32.9 0.1 27.9 0.4 8.6
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 40.7

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 20.2 – S S 48.4 – 32.3
Single modes 23.8 7.3 S S 48.1 3.8 29.9
Truck 23.8 7.3 S S 48.2 3.8 29.9
Rail – – – – – – –
All other Single modes S S S S S S 21.6
Multiple modes S S 40.6 0.3 45.0 0.3 20.1
Parcel, USPS or courier S S 40.6 0.3 45.0 0.3 20.1
All other multiple modes – – – – – – –
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 33.4 – 23.3 – 25.1 – 15.2
Single modes 38.1 4.9 24.3 3.2 27.8 4.0 16.7
Truck 37.1 5.3 23.3 3.7 26.1 4.0 15.7
Rail S S S S 44.5 4.8 28.5
All other Single modes S S 45.4 0.6 S S 12.6
Multiple modes 48.8 4.9 41.6 3.3 41.5 3.7 4.7
Parcel, USPS or courier S S 28.3 0.9 26.7 1.5 4.8
All other multiple modes S S S S S S 25.8
Other and unknown modes 36.8 0.5 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 28.2 – 26.3 – 27.6 – 24.4
Single modes 29.7 6.1 26.6 3.4 28.1 3.7 42.8
Truck 29.6 6.0 26.6 3.4 28.1 3.7 43.8
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes 36.5 5.8 48.4 3.3 S S 38.5
Parcel, USPS or courier 36.5 5.8 48.4 3.3 S S 38.5
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 47.7

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 40.9 – S
Single modes S S S S 43.2 14.4 49.6
Truck S S S S 43.2 14.4 49.6
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 29.8
Parcel, USPS or courier S S S S S S 29.8
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.