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 6.5 31.3 13.6 18.3
Single modes 6.6 1.9 33.8 3.6 14.3 1.1 35.8
Truck 6.6 2.5 S S 12.3 4.5 32.5
Rail 20.0 1.6 28.0 3.8 32.4 6.2 10.5
All other Single modes 14.6 1.8 35.0 6.6 29.2 5.2 8.2
Multiple modes 28.4 2.0 13.8 0.1 17.8 0.7 11.3
Parcel, USPS or courier 32.2 2.0 44.4 48.9 0.3 11.6
All other multiple modes 20.5 0.2 17.3 20.4 0.7 8.3
Other and unknown modes 15.1 0.4 33.3 3.6 26.9 0.6 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 22.1 32.3 33.6 S
Single modes 22.6 0.9 33.0 4.1 34.3 1.8 S
Truck 19.2 10.0 30.3 14.0 33.8 4.1 S
Rail 45.6 8.1 44.9 12.6 S S 25.8
All other Single modes S S S S 37.6 4.6 S
Multiple modes S S S S S S 28.3
Parcel, USPS or courier S S S S S S 28.4
All other multiple modes S S S S S S 31.2
Other and unknown modes 42.1 0.9 S S S S S

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 30.4 30.5 34.6 39.3
Single modes 31.2 1.6 30.8 1.0 35.1 2.0 41.4
Truck 33.6 6.1 25.0 8.2 34.2 9.9 40.3
Rail S S S S S S 27.9
All other Single modes S S S S S S 31.6
Multiple modes S S 47.4 0.9 S S 21.3
Parcel, USPS or courier S S S S S S 27.7
All other multiple modes S S 46.6 0.7 S S 24.2
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 41.2 S S S S S
Single modes 41.6 5.0 S S S S S
Truck 43.5 10.0 S S S S S
Rail 45.6 0.9 44.8 0.3 49.3 3.0 30.4
All other Single modes S S S S S S 27.9
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 42.1 14.9 39.0 8.9 39.7

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 12.5 12.3 18.4 S
Single modes 12.8 1.5 11.5 7.1 18.8 0.8 S
Truck 32.6 6.8 28.3 5.3 31.7 1.5 S
Rail 48.9 2.3 S S S S 25.5
All other Single modes 12.0 6.6 12.7 6.7 12.0 6.6 17.8
Multiple modes S S S S S S 33.0
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 31.6
Other and unknown modes 41.4 1.5 49.1 7.1 43.7 0.8 30.5

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 25.8 43.1 27.7 21.6
Single modes 24.4 8.5 43.3 2.3 24.6 5.1 24.3
Truck 25.6 8.1 S S 20.2 6.5 S
Rail 24.5 2.5 32.9 7.9 35.3 8.7 34.5
All other Single modes 41.6 0.4 S S S S 15.8
Multiple modes S S S S S S 15.3
Parcel, USPS or courier S S S S S S 15.4
All other multiple modes 43.5 0.5 42.3 2.2 44.8 4.7 26.3
Other and unknown modes 41.6 0.8 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 11.1 24.0 33.1 19.2
Single modes 9.0 4.3 24.8 1.4 35.2 2.2 31.0
Truck 9.3 5.1 23.0 6.2 20.2 6.4 28.7
Rail 14.9 3.2 45.0 6.6 49.5 7.6 13.3
All other Single modes S S S S S S 27.1
Multiple modes 49.9 4.1 23.3 0.6 23.6 1.9 45.3
Parcel, USPS or courier S S S S 44.4 44.5
All other multiple modes 27.6 0.7 23.8 0.5 23.6 1.9 11.4
Other and unknown modes 33.1 0.8 S S 41.6 0.4 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 15.2 24.0 24.9 10.6
Single modes 15.1 2.4 24.6 1.5 23.2 4.1 10.4
Truck 16.1 3.8 25.8 4.1 25.1 9.7 11.4
Rail 48.1 1.5 S S S S 26.6
All other Single modes S S S S S S 18.7
Multiple modes 31.7 2.3 40.5 1.5 S S 42.9
Parcel, USPS or courier 35.7 2.5 S S S S 41.4
All other multiple modes 45.3 0.8 S S S S 23.8
Other and unknown modes 33.0 1.0 45.5 0.3 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 17.8 16.8 16.0 47.4
Single modes 16.9 2.3 15.6 4.6 21.9 7.6 S
Truck 18.2 3.3 15.7 4.6 22.4 7.8 S
Rail S S S S S S 31.6
All other Single modes 40.1 3.3 25.1 0.3 29.0 1.4 3.4
Multiple modes 25.2 2.7 S S 37.0 7.3 37.0
Parcel, USPS or courier 26.2 2.9 S S S S 36.8
All other multiple modes 41.0 0.5 36.4 1.0 36.0 2.6 21.7
Other and unknown modes 40.3 0.9 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 16.7 16.2 14.5 15.7
Single modes 20.5 4.4 16.2 1.5 14.7 3.4 13.5
Truck 20.5 4.4 16.2 1.5 14.8 3.4 11.8
Rail S S S S S S 31.6
All other Single modes S S S S S S 18.8
Multiple modes 31.7 4.6 25.8 0.7 29.7 3.3 17.5
Parcel, USPS or courier 34.6 4.5 19.8 0.2 29.9 2.2 13.8
All other multiple modes 45.9 0.4 47.9 0.7 46.4 2.9 18.5
Other and unknown modes S S 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 27.8 S S S S 41.4
Single modes 43.2 12.8 S S S S S
Truck S S S S S S S
Rail S S 40.9 11.2 S S 33.3
All other Single modes
Multiple modes 37.2 12.7 S S S S 29.0
Parcel, USPS or courier 37.2 12.7 S S S S 29.0
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.