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 17.1 7.1 14.1 6.9
Single modes 21.5 3.6 7.8 1.5 11.4 6.4 20.5
Truck 21.8 3.3 11.3 5.9 13.7 6.9 20.6
Rail 35.5 0.3 39.3 1.3 46.6 3.0 11.4
All other Single modes 24.2 0.7 33.2 6.5 32.9 4.7 10.3
Multiple modes 19.6 3.5 38.9 0.6 S S 4.1
Parcel, USPS or courier 19.8 3.4 14.8 12.1 0.5 4.1
All other multiple modes 43.5 0.2 S S S S 21.0
Other and unknown modes 27.3 0.5 48.6 1.1 S S 32.3

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 41.1 35.3 49.5 S
Single modes 45.7 12.4 35.3 5.9 S S S
Truck 45.7 12.4 35.3 5.9 S S S
Rail
All other Single modes
Multiple modes S S S S S S 48.6
Parcel, USPS or courier 48.1 12.3 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 28.4

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 11.3 22.5 23.3 S
Single modes 12.1 2.4 22.6 0.2 24.1 1.3 S
Truck 12.1 2.4 22.5 0.2 24.0 1.4 S
Rail S S S S S S 30.3
All other Single modes S S S S S S 28.0
Multiple modes S S 39.8 0.1 48.9 1.1 16.4
Parcel, USPS or courier S S 24.8 29.9 0.2 17.0
All other multiple modes S S S S S S 28.7
Other and unknown modes S S S S S S 31.2

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 S S 22.7 49.7 S
Single modes S S 23.6 3.4 49.9 2.5 S
Truck S S 23.4 3.3 S S S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 28.3
Parcel, USPS or courier S S S S S S 28.3
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 14.5 19.4 26.3 16.0
Single modes 14.5 0.3 19.5 0.2 26.5 1.1 14.3
Truck 24.5 10.2 17.3 10.4 34.1 12.4 15.3
Rail 36.4 0.5 S S S S 26.2
All other Single modes 28.3 10.2 33.8 10.5 37.4 12.3 20.8
Multiple modes S S S S S S 28.4
Parcel, USPS or courier S S S S S S 30.1
All other multiple modes S S S S S S 33.5
Other and unknown modes S S S S S S 30.3

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 48.2 24.5 38.5 7.4
Single modes S S 27.1 8.0 33.1 10.9 19.8
Truck S S 28.6 9.7 33.8 12.5 19.9
Rail S S S S S S 20.4
All other Single modes 31.8 0.5 S S S S 11.3
Multiple modes 39.8 7.5 S S S S 9.2
Parcel, USPS or courier 39.8 7.4 29.5 0.9 31.5 1.2 9.2
All other multiple modes 49.3 0.2 S S S S 21.1
Other and unknown modes 41.6 0.3 S S S S 28.6

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 9.2 14.2 32.8 12.8
Single modes 12.7 6.0 16.2 3.0 37.2 4.6 16.7
Truck 12.8 5.9 16.2 2.9 37.5 4.6 20.5
Rail S S S S S S 48.7
All other Single modes 40.1 0.2 23.9 43.4 0.2 13.8
Multiple modes 34.8 5.6 30.3 1.8 36.5 4.2 9.7
Parcel, USPS or courier 34.9 5.6 30.3 1.8 36.7 4.2 9.7
All other multiple modes S S S S S S 32.5
Other and unknown modes 35.8 1.2 40.7 1.9 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 17.8 31.6 22.7 10.8
Single modes 25.5 4.2 32.2 1.5 24.1 2.2 19.3
Truck 26.5 4.6 33.4 3.2 30.1 8.1 21.2
Rail 31.7 0.5 43.3 2.7 45.6 7.3 18.6
All other Single modes 35.0 0.6 S S S S 10.6
Multiple modes 12.8 3.8 22.7 0.3 29.9 0.8 18.2
Parcel, USPS or courier 12.8 3.8 22.5 0.3 28.8 0.7 18.2
All other multiple modes S S S S S S 31.6
Other and unknown modes 36.7 2.4 36.6 1.3 49.2 2.1 44.0

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 18.4 19.6 18.0 10.1
Single modes 11.7 5.9 20.9 3.4 24.3 6.0 48.2
Truck 13.3 4.9 21.0 3.4 24.5 6.0 S
Rail S S S S S S 30.2
All other Single modes 34.1 2.5 S S S S 10.4
Multiple modes 30.1 5.8 39.4 3.3 25.2 5.4 9.3
Parcel, USPS or courier 30.1 5.8 42.1 3.3 29.5 5.7 9.3
All other multiple modes S S S S S S 27.9
Other and unknown modes 24.7 1.8 40.3 1.1 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 13.3 20.5 28.3 14.4
Single modes 15.5 6.3 21.1 1.6 29.1 6.3 23.1
Truck 16.1 6.7 21.2 1.6 29.0 6.3 28.0
Rail
All other Single modes S S 49.9 S S 22.8
Multiple modes 35.0 5.8 37.5 0.9 42.1 4.0 10.0
Parcel, USPS or courier 35.5 5.7 36.6 0.9 39.2 3.9 10.0
All other multiple modes S S S S S S 31.6
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 S S S S 45.7 S
Single modes S S S S 46.6 13.9 S
Truck S S S S 46.6 13.9 S
Rail
All other Single modes
Multiple modes S S 45.6 11.4 42.6 13.9 S
Parcel, USPS or courier S S 45.6 11.4 42.6 13.9 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.