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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 – 23.9 – 42.0 – 19.6
Single modes 10.5 4.4 26.9 4.2 42.6 0.6 21.5
Truck 9.5 3.9 22.3 3.8 39.1 8.9 21.8
Rail 46.0 1.1 49.3 5.1 S S 41.9
All other Single modes S S S S S S 30.0
Multiple modes 32.6 4.8 S S S S 11.7
Parcel, USPS or courier 32.8 4.8 31.0 – 42.8 0.2 11.7
All other multiple modes S S S S S S 31.6
Other and unknown modes 32.5 0.8 49.2 4.3 33.2 0.4 30.1

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 28.7
Single modes S S S S S S 28.7
Truck S S S S S S 28.7
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes – – – – – – –
Parcel, USPS or courier – – – – – – –
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 44.1 – 44.0 – S S S
Single modes 44.4 0.6 44.3 0.9 S S S
Truck 44.4 0.6 44.3 0.9 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 32.5

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 33.4 – 26.5 – 33.0 – 22.4
Single modes 33.4 – 26.5 – 32.9 – 24.3
Truck 36.7 10.4 29.3 10.3 37.0 15.7 26.7
Rail S S S S S S 31.0
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 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 12.3 – 15.3 – 24.7 – 18.4
Single modes 12.2 3.4 12.9 9.6 24.4 4.9 18.4
Truck 12.4 2.6 12.6 7.0 18.5 8.9 15.1
Rail 28.7 3.1 29.3 7.2 32.1 12.1 18.7
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 31.6
Parcel, USPS or courier – – – – – – –
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 27.9

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 25.2 – S S S S 15.0
Single modes 38.1 12.8 S S S S 38.3
Truck 38.1 12.8 S S S S 38.3
Rail – – – – – – –
All other Single modes – – – – – – –
Multiple modes 42.1 12.8 41.7 2.2 39.5 4.5 18.8
Parcel, USPS or courier 42.1 12.8 41.7 2.2 39.5 4.5 18.8
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 32.0

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 27.1 – S S 30.6 – 22.1
Single modes 24.6 5.2 S S 31.4 3.8 33.3
Truck 24.6 5.2 S S 31.2 3.7 27.3
Rail 45.0 0.1 43.8 0.5 46.8 0.7 26.4
All other Single modes S S S S S S 32.6
Multiple modes S S S S S S 19.8
Parcel, USPS or courier S S S S S S 19.8
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 16.3 – 47.7 – 44.6 – 20.0
Single modes 15.6 0.8 48.0 0.4 44.8 0.4 18.2
Truck 13.1 4.6 30.1 9.4 22.5 14.6 19.4
Rail S S S S S S 39.1
All other Single modes S S S S S S 29.8
Multiple modes 29.2 0.5 40.6 – S S 18.0
Parcel, USPS or courier 29.2 0.5 40.6 – S S 18.0
All other multiple modes – – – – – – –
Other and unknown modes S S 44.2 0.4 S S 25.6

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 30.7 – 29.5 – S S S
Single modes 40.9 7.8 30.0 5.0 S S S
Truck 41.6 8.3 30.0 5.0 S S S
Rail S S S S S S 31.6
All other Single modes – – – – – – –
Multiple modes 36.2 7.3 30.5 3.1 43.4 12.4 21.1
Parcel, USPS or courier 36.2 7.3 30.5 3.1 43.4 12.4 21.1
All other multiple modes – – – – – – –
Other and unknown modes S S 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 27.8 – 23.9 – 25.2 – 19.0
Single modes 29.3 2.5 24.0 0.1 25.6 0.7 17.0
Truck 29.4 2.8 24.0 0.1 25.6 0.7 10.8
Rail – – – – – – –
All other Single modes S S S S S S 31.6
Multiple modes S S 47.3 – S S 15.4
Parcel, USPS or courier S S 47.3 – S S 15.4
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 31.3

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 25.8
Single modes S S S S S S S
Truck S S S S S S S
Rail S S S S S S 31.6
All other Single modes – – – – – – –
Multiple modes S S S S S S 30.1
Parcel, USPS or courier S S S S S S 30.1
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.