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 4.2 7.6 8.6 10.4
Single modes 4.6 1.7 7.8 0.4 8.7 0.2 11.7
Truck 5.5 2.2 11.5 4.2 8.2 4.0 11.9
Rail 11.7 0.4 14.6 4.2 14.6 4.1 7.0
All other Single modes 38.3 0.8 S S S S 13.7
Multiple modes 19.9 1.5 39.4 0.2 13.2 0.1 4.8
Parcel, USPS or courier 20.5 1.5 16.4 17.3 4.8
All other multiple modes 38.9 S S 26.3 0.2 S
Other and unknown modes 32.0 0.6 S S 39.5 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 27.3 32.6 45.2 44.5
Single modes 27.1 1.3 37.0 8.7 48.1 9.3 37.5
Truck 27.1 1.3 37.0 8.7 48.1 9.3 37.6
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 21.9
Parcel, USPS or courier S S S S S S 32.0
All other multiple modes S S S S S S 29.2
Other and unknown modes S S 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 15.1 30.2 29.5 36.6
Single modes 15.3 0.4 30.2 0.4 29.7 0.8 12.8
Truck 14.9 1.2 31.5 2.9 31.5 4.1 13.1
Rail S S S S S S 30.1
All other Single modes
Multiple modes S S S S S S 26.0
Parcel, USPS or courier S S S S S S 26.0
All other multiple modes
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 36.3 21.4 18.2 S
Single modes 36.3 21.4 18.4 1.1 S
Truck 35.5 0.9 22.2 3.6 17.3 5.9 S
Rail S S S S S S 47.8
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 31.6
Other and unknown modes S S S S S S 32.4

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 13.4 18.0 15.1 S
Single modes 13.4 18.0 15.1 S
Truck 16.8 6.2 41.3 6.8 22.3 0.9 S
Rail 17.5 6.2 15.7 6.8 15.8 0.9 5.9
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 S

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 15.6 21.9 21.0 12.0
Single modes 16.9 2.4 23.1 3.1 23.3 4.0 15.2
Truck 16.9 2.4 23.1 3.0 23.3 3.7 15.4
Rail S S S S S S 33.2
All other Single modes S S S S S S 20.5
Multiple modes 31.7 2.3 27.3 0.7 29.5 2.4 9.0
Parcel, USPS or courier 36.1 2.3 44.7 0.4 S S 9.0
All other multiple modes 46.3 0.3 40.1 0.6 36.2 2.3 30.0
Other and unknown modes S S S S S S 24.8

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 7.8 23.1 8.7 13.9
Single modes 8.8 2.8 23.3 0.4 9.0 0.5 16.1
Truck 8.9 2.7 24.0 1.5 10.0 2.6 16.3
Rail 28.1 0.6 25.1 1.4 27.0 2.5 16.3
All other Single modes S S S S S S 18.8
Multiple modes 31.9 2.5 24.4 0.2 18.7 0.4 4.3
Parcel, USPS or courier 32.2 2.5 32.4 0.2 34.5 0.5 4.1
All other multiple modes 48.6 49.1 48.9 0.3 25.8
Other and unknown modes 50.0 2.1 41.9 0.3 35.6 0.1 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 10.4 26.0 14.1 27.5
Single modes 11.2 2.1 26.1 0.4 14.2 0.2 46.6
Truck 12.7 3.9 31.5 6.6 13.2 7.8 44.8
Rail 36.8 0.4 41.0 4.7 36.4 6.4 41.2
All other Single modes S S S S S S 23.0
Multiple modes 30.5 2.0 25.3 0.1 34.8 0.2 18.8
Parcel, USPS or courier 30.8 2.0 24.8 0.1 34.8 0.2 18.8
All other multiple modes S S S S S S 31.6
Other and unknown modes 42.0 0.3 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 16.6 38.0 33.2 17.1
Single modes 19.4 5.3 39.2 1.6 34.3 1.6 24.3
Truck 22.5 7.1 39.3 1.6 34.5 1.6 S
Rail S S S S S S 29.8
All other Single modes S S S S 44.8 0.3 23.7
Multiple modes 35.2 5.1 29.6 1.6 29.8 1.6 13.6
Parcel, USPS or courier 35.2 5.1 29.7 1.6 29.8 1.6 13.6
All other multiple modes S S S S S S 31.6
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 10.6 10.5 15.7 11.2
Single modes 10.3 3.0 10.5 0.3 16.1 1.2 15.9
Truck 10.3 2.9 10.6 0.4 16.4 1.6 16.3
Rail
All other Single modes S S S S S S 29.9
Multiple modes 38.6 3.0 36.0 0.4 33.7 1.3 8.5
Parcel, USPS or courier 38.6 3.0 36.0 0.4 33.7 1.3 8.5
All other multiple modes
Other and unknown modes 17.1 0.1 22.9 24.0 24.2

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 27.1 45.1 S S 21.0
Single modes 34.2 10.0 45.6 3.1 S S 31.4
Truck 34.2 10.0 45.6 3.1 S S 31.6
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 27.9
Parcel, USPS or courier S S S S S S 27.9
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.