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 5.0 11.8 13.5 15.2
Single modes 4.0 1.5 12.5 1.6 16.5 4.8 12.0
Truck 3.6 1.7 16.1 3.4 17.6 5.2 12.8
Rail 13.5 0.1 28.1 3.8 27.3 4.9 11.8
All other Single modes S S 44.5 1.4 43.3 0.6 4.0
Multiple modes 18.6 1.2 37.8 1.6 39.6 4.8 11.6
Parcel, USPS or courier 18.7 1.2 16.7 13.1 0.1 11.4
All other multiple modes 25.0 40.6 1.5 41.9 4.8 22.1
Other and unknown modes 28.3 0.9 24.7 0.3 22.3 0.3 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 34.4 39.8 S S 28.9
Single modes 34.6 0.5 39.9 S S 27.4
Truck 34.6 0.5 39.9 S S 27.4
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 32.3
Parcel, USPS or courier S S S S S S 32.3
All other multiple modes
Other and unknown modes S S S S S S 29.9

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 20.2 27.2 14.4 S
Single modes 20.1 1.9 28.2 3.0 14.5 2.3 S
Truck 20.2 1.9 28.3 3.0 14.8 2.3 S
Rail S S S S S S 29.8
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 29.7
Parcel, USPS or courier S S S S S S 25.1
All other multiple modes S S S S S S 26.7
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 16.0 26.4 S S 30.5
Single modes 15.9 26.4 S S 30.7
Truck 16.6 1.8 26.8 1.0 S S 29.6
Rail 19.6 1.8 28.8 1.0 18.8 4.9 30.0
All other Single modes
Multiple modes S S S S S S 27.9
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 27.9
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 44.1 14.1 17.4 S
Single modes 46.2 5.4 16.2 6.1 21.0 11.5 S
Truck S S 41.7 12.3 42.1 11.8 S
Rail 29.7 11.3 31.1 12.6 30.9 13.2 15.6
All other Single modes 44.5 4.9 44.9 5.0 47.4 1.6 20.7
Multiple modes 42.6 5.3 42.0 6.0 44.9 11.3 22.8
Parcel, USPS or courier S S S S S S 32.7
All other multiple modes 42.7 5.3 42.0 6.0 44.9 11.3 23.0
Other and unknown modes S S S S S S 31.3

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 14.2 27.2 27.2 18.3
Single modes 16.4 4.1 27.6 1.2 26.7 1.2 32.6
Truck 17.0 4.3 27.6 1.2 26.9 1.5 26.3
Rail
All other Single modes S S S S S S 14.2
Multiple modes 22.1 4.1 S S S S 20.7
Parcel, USPS or courier 22.1 4.1 S S S S 20.6
All other multiple modes S S S S S S 31.6
Other and unknown modes 46.1 0.4 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 14.2 22.7 15.5 15.7
Single modes 15.2 2.8 22.9 1.4 16.3 1.5 29.1
Truck 15.3 2.9 23.2 1.2 15.5 1.5 29.7
Rail 32.7 0.3 35.1 0.5 43.2 1.1 22.9
All other Single modes 46.5 0.1 S S S S 7.9
Multiple modes 19.8 2.2 26.5 0.4 31.7 1.1 7.9
Parcel, USPS or courier 19.7 2.2 24.8 0.3 23.7 0.4 7.6
All other multiple modes S S S S S S 25.8
Other and unknown modes 39.2 1.5 S S 42.1 0.7 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 6.7 27.9 9.7 15.9
Single modes 8.6 2.9 28.3 0.8 10.2 2.2 19.8
Truck 8.8 3.3 29.5 2.4 12.4 4.3 20.5
Rail 33.3 0.5 26.9 1.7 29.6 3.1 18.9
All other Single modes 47.1 0.2 S S S S 14.3
Multiple modes 24.2 2.8 37.4 0.5 34.9 0.9 13.2
Parcel, USPS or courier 27.2 2.9 28.7 0.3 33.1 0.4 13.4
All other multiple modes 38.1 0.3 S S S S 32.5
Other and unknown modes 19.0 0.3 32.6 0.4 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 17.2 15.9 20.6 17.2
Single modes 17.9 5.9 18.0 5.3 21.3 1.8 22.8
Truck 17.9 6.8 18.3 5.4 22.0 3.2 24.4
Rail 45.1 0.1 45.6 0.6 S S 27.7
All other Single modes S S S S 43.3 0.1 8.6
Multiple modes 40.6 4.3 20.2 0.4 11.8 0.5 14.5
Parcel, USPS or courier 40.6 4.3 20.3 0.4 12.5 0.5 14.5
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S 38.6 1.5 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 8.5 13.4 15.4 24.3
Single modes 7.9 1.0 12.9 3.3 16.2 3.7 41.7
Truck 7.9 1.0 12.5 3.3 15.5 3.7 41.7
Rail S S S S S S 31.2
All other Single modes S S S S S S 25.2
Multiple modes 17.8 1.0 30.8 0.5 23.2 0.4 33.0
Parcel, USPS or courier 17.8 1.0 30.8 0.5 23.2 0.4 33.0
All other multiple modes S S S S S S 31.6
Other and unknown modes 27.0 0.1 S S S S S

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 18.9
Single modes S S S S S S 27.7
Truck S S S S S S 49.8
Rail S S S S S S 31.6
All other Single modes S S S S S S 29.9
Multiple modes S S S S S S 28.8
Parcel, USPS or courier S S S S S S 28.8
All other multiple modes
Other and unknown modes S S S S S S 31.5

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.