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 21.1 9.2 25.2 8.4
Single modes 22.6 1.1 9.1 0.8 23.6 2.2 10.1
Truck 18.4 2.0 8.1 5.2 7.9 6.7 10.0
Rail S S 44.3 4.3 49.5 6.7 11.3
All other Single modes 18.5 1.1 22.1 3.5 28.3 2.6 10.6
Multiple modes 12.2 0.8 45.3 0.7 S S 7.6
Parcel, USPS or courier 13.4 0.7 31.4 24.1 0.2 7.5
All other multiple modes 37.5 0.3 S S S S 16.8
Other and unknown modes 25.4 0.4 36.5 0.4 38.8 0.4 32.6

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 31.0 48.4 S S 27.9
Single modes 31.5 2.8 49.6 4.4 S S 26.7
Truck 37.8 10.2 42.3 14.3 37.0 18.1 23.5
Rail S S S S S S 29.0
All other Single modes S S S S S S 31.6
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 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 18.8 26.1 48.0 S
Single modes 16.0 1.7 23.6 1.7 34.1 7.1 S
Truck 16.5 2.0 26.9 4.9 38.8 10.2 S
Rail 27.0 1.5 29.7 5.0 34.7 10.3 21.3
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 30.8
Parcel, USPS or courier S S S S S S 30.2
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 39.4

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 26.9 29.3 21.8
Single modes S S 27.2 1.4 29.5 0.6 22.7
Truck S S 29.6 5.1 29.1 10.0 22.2
Rail S S S S S S 33.0
All other Single modes S S S S S S 30.4
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 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 17.2 18.3 30.1 43.8
Single modes 18.1 2.0 18.3 2.4 24.4 7.5 31.6
Truck 34.8 11.3 25.4 8.9 20.8 8.8 25.5
Rail 49.5 1.5 S S 35.9 4.0 18.2
All other Single modes 21.0 10.1 22.4 7.1 29.4 7.9 20.0
Multiple modes S S S S S S 31.0
Parcel, USPS or courier S S S S S S 32.4
All other multiple modes S S S S S S 35.5
Other and unknown modes 40.6 1.9 40.5 1.3 40.8 1.0 23.7

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 11.7 20.5 23.8 24.4
Single modes 10.7 2.0 20.5 0.5 24.2 1.6 24.1
Truck 11.0 1.9 19.4 3.3 23.5 5.2 24.7
Rail 30.7 1.1 32.2 3.1 33.2 5.4 18.0
All other Single modes 35.1 S S S S 16.6
Multiple modes S S 46.4 0.5 S S S
Parcel, USPS or courier S S 34.9 0.2 31.6 0.2 S
All other multiple modes S S S S S S 26.2
Other and unknown modes S S 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 11.8 27.5 21.2 13.3
Single modes 13.4 4.6 28.3 3.2 21.8 2.3 21.0
Truck 13.7 4.7 28.6 3.4 22.6 3.8 21.4
Rail 27.4 0.5 34.5 1.1 32.4 2.5 22.5
All other Single modes S S S S S S 29.0
Multiple modes 28.8 2.3 34.3 0.4 28.6 0.8 5.0
Parcel, USPS or courier 28.8 2.3 34.3 0.4 28.6 0.8 5.0
All other multiple modes
Other and unknown modes S S S S S S 30.3

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 11.3 22.4 25.9 9.1
Single modes 11.9 1.4 22.2 0.7 26.0 1.5 13.2
Truck 11.7 2.0 21.0 3.3 15.1 5.6 12.6
Rail 21.5 1.2 36.4 2.9 S S 14.0
All other Single modes 47.5 0.3 S S S S 14.5
Multiple modes 28.6 1.1 S S 44.8 1.0 11.1
Parcel, USPS or courier 33.4 1.2 S S S S 10.3
All other multiple modes S S S S S S 24.5
Other and unknown modes 26.8 0.5 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 S S 44.3 S S 19.4
Single modes S S 44.7 0.8 S S 33.5
Truck S S 37.2 4.5 40.3 7.3 34.7
Rail S S S S S S 20.3
All other Single modes S S 31.3 35.8 9.7
Multiple modes 22.2 2.4 24.9 0.6 32.2 1.3 9.7
Parcel, USPS or courier 26.0 2.4 36.3 0.3 38.0 0.3 9.6
All other multiple modes 47.1 0.3 40.5 0.4 S S 37.9
Other and unknown modes S S S S S S 29.1

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 10.8 24.3 14.8 10.7
Single modes 12.1 1.9 24.5 0.3 14.4 0.5 14.6
Truck 12.7 3.0 28.5 8.6 16.2 3.6 14.5
Rail S S S S S S S
All other Single modes 47.1 S S S S 43.2
Multiple modes 16.0 2.0 34.2 0.2 37.5 0.5 10.5
Parcel, USPS or courier 16.0 2.0 34.2 0.2 37.5 0.5 10.5
All other multiple modes
Other and unknown modes 34.6 0.6 36.8 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 39.7 29.1 41.0 S
Single modes 40.9 10.3 29.1 0.9 41.1 2.0 S
Truck S S 35.2 9.9 S S S
Rail S S S S S S 31.6
All other Single modes
Multiple modes S S S S S S 48.5
Parcel, USPS or courier S S S S S S 48.5
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.