Table B-6. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for CBSA of Origin: 2002

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 10.9 13.3 7.8 28.2
Single modes 13.5 4.2 13.4 0.8 8.4 2.7 37.7
Truck 15.1 5.5 13.4 1.7 9.4 3.6 37.1
Rail S S S S S S 31.4
All other Single modes S S S S S S 14.1
Multiple modes 19.5 4.0 S S 35.6 1.3 15.9
Parcel, USPS or courier 19.9 4.0 21.2 0.2 27.0 0.7 15.9
All other multiple modes S S S S S S 32.6
Other and unknown modes 30.8 0.7 45.6 0.8 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 46.6 36.8 S S 46.1
Single modes 46.9 9.1 38.2 6.3 S S 37.1
Truck 47.3 9.5 43.3 8.5 42.4 16.7 30.8
Rail S S S S S S 31.2
All other Single modes
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 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 38.0 21.5 26.3 45.0
Single modes 40.4 4.9 22.3 4.2 24.6 4.5 34.9
Truck 40.4 4.9 22.3 4.2 24.6 4.5 34.9
Rail
All other Single modes
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 28.1
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 24.3 23.1 25.0 13.2
Single modes 24.1 0.4 23.1 0.1 25.0 13.3
Truck 24.1 0.4 23.1 0.1 25.0 13.3
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 31.5

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 41.2 41.2 45.4 23.1
Single modes S S S S S S 24.9
Truck S S S S S S 30.2
Rail
All other Single modes S S S S S S 28.5
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

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 26.3 32.0 19.7 19.2
Single modes S S 32.7 1.4 20.2 1.2 32.9
Truck S S 32.7 1.4 20.2 1.2 32.9
Rail
All other Single modes S S S S S S S
Multiple modes 29.9 11.3 28.5 1.1 29.5 0.8 19.5
Parcel, USPS or courier 29.9 11.3 28.5 1.1 29.5 0.8 19.5
All other multiple modes
Other and unknown modes S S 41.5 0.6 43.5 0.5 27.2

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 12.8 22.1 34.0 22.1
Single modes 16.9 7.0 23.3 2.1 36.0 4.5 34.5
Truck 16.9 7.0 23.6 2.3 36.0 4.5 26.0
Rail S S S S S S 31.6
All other Single modes S S S S 48.1 0.2 23.7
Multiple modes 45.6 6.8 30.2 0.9 S S 12.5
Parcel, USPS or courier 45.6 6.8 30.2 0.9 S S 12.5
All other multiple modes
Other and unknown modes 26.3 1.1 32.2 1.7 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 17.6 S S 41.2 26.0
Single modes 22.4 7.6 S S 43.2 3.5 S
Truck 22.8 7.5 S S 43.5 3.6 S
Rail
All other Single modes S S S S 46.5 1.3 17.2
Multiple modes 38.2 7.8 S S S S 21.3
Parcel, USPS or courier 38.2 7.8 S S S S 17.6
All other multiple modes S S S S S S 31.6
Other and unknown modes 32.0 2.6 S S 40.3 1.3 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 31.7 S S 35.7 S
Single modes 34.6 9.9 S S 32.9 5.6 S
Truck 41.3 10.8 S S 33.1 5.8 S
Rail
All other Single modes S S S S S S 19.7
Multiple modes 37.4 9.9 28.3 7.4 26.2 4.9 27.6
Parcel, USPS or courier 37.2 9.8 29.4 7.3 26.9 4.9 28.3
All other multiple modes S S S S S S 31.3
Other and unknown modes S S 49.4 4.1 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 21.3 17.9 26.2 S
Single modes 21.8 0.9 18.0 0.3 26.5 0.6 S
Truck 20.9 0.9 18.0 0.3 26.6 0.6 S
Rail
All other Single modes S S S S S S 23.7
Multiple modes 34.0 0.5 40.6 44.8 0.5 S
Parcel, USPS or courier 34.0 0.5 40.6 44.8 0.5 S
All other multiple modes
Other and unknown modes S S 45.8 0.3 44.3 0.3 29.0

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 37.2
Single modes S S S S S S 36.8
Truck S S S S S S 36.8
Rail
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

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.