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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 10.7 – 15.6 – 25.6 – 36.1
Single modes 13.0 3.1 15.7 0.3 25.7 1.6 S
Truck 15.7 4.7 18.8 7.2 31.8 8.0 S
Rail 40.8 1.4 S S 47.6 7.4 S
All other Single modes 20.4 2.2 S S S S 5.8
Multiple modes 17.7 2.5 39.3 0.2 41.8 0.9 15.7
Parcel, USPS or courier 17.9 2.5 39.3 0.2 41.8 0.9 16.0
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S 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 S S S S S S 45.1
Single modes S S S S S S 32.2
Truck S S S S S S 30.7
Rail S S S S S S 31.6
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 – – – – – – –

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 46.2 – 45.6 – S S 41.2
Single modes 47.8 3.1 45.8 0.5 S S S
Truck 47.8 3.1 45.8 0.5 S S S
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes S S S S S S 37.3
Parcel, USPS or courier S S S S S S 37.3
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 31.6

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 35.8 – 34.4 – 36.9 – S
Single modes 35.8 – 34.4 – 36.9 – S
Truck 44.4 10.2 37.7 10.5 35.8 10.5 S
Rail 39.2 12.9 40.2 13.1 48.6 12.1 S
All other Single modes S S S S S S 31.6
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
All other multiple modes – – – – – – –
Other and unknown modes – – – – – – –

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 29.9 – 37.5 – S S S
Single modes 29.9 – 37.5 – S S S
Truck 29.9 – 37.5 – S S S
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 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 26.5 – S S 26.3 – S
Single modes 30.5 10.0 S S 31.7 12.0 S
Truck 33.9 11.5 S S 37.8 13.8 S
Rail S S S S S S 31.6
All other Single modes S S 47.8 1.0 42.4 5.7 21.7
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 31.2

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 23.4 – 36.7 – 22.3 – 36.1
Single modes 24.0 10.3 38.3 10.0 21.5 10.2 S
Truck 24.0 10.3 38.4 10.0 21.4 10.2 S
Rail – – – – – – –
All other Single modes S S S S S S 24.2
Multiple modes S S S S S S 36.6
Parcel, USPS or courier S S S S S S 36.6
All other multiple modes – – – – – – –
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 20.3 – 34.6 – 49.5 – 27.5
Single modes 22.2 2.9 35.2 5.2 S S S
Truck 23.5 3.9 35.3 5.4 S S S
Rail S S S S S S S
All other Single modes 32.7 2.4 44.1 – 45.1 2.7 14.5
Multiple modes 27.5 2.0 S S S S 15.5
Parcel, USPS or courier 27.5 2.0 S S S S 15.5
All other multiple modes – – – – – – –
Other and unknown modes 40.7 1.1 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 24.2 – 30.4 – 39.7 – 39.9
Single modes 25.3 7.3 31.7 7.2 39.7 5.4 S
Truck 28.6 5.6 33.4 9.6 45.4 10.5 S
Rail – – – – – – –
All other Single modes 27.2 9.2 42.3 9.6 38.8 9.3 4.3
Multiple modes 27.8 6.5 S S S S 17.7
Parcel, USPS or courier 27.8 6.5 S S S S 17.7
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 41.1

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 45.0 – 48.3 – 39.7 – S
Single modes 45.9 6.1 49.9 4.9 40.5 4.9 S
Truck 45.7 5.9 S S 40.7 5.1 S
Rail – – – – – – –
All other Single modes S S S S S S 36.4
Multiple modes 48.8 6.1 S S 48.2 4.9 20.8
Parcel, USPS or courier S S S S 48.2 4.9 20.5
All other multiple modes S S S S S S 31.6
Other and unknown modes 46.6 0.1 S S S S 48.8

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 32.1 – S S S S 27.6
Single modes S S S S S S S
Truck S S S S S S S
Rail – – – – – – –
All other Single modes S S S S S S 31.6
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 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.