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 8.0 22.3 26.2 10.7
Single modes 9.2 2.1 22.2 0.4 26.7 3.8 26.7
Truck 9.3 2.4 11.5 6.4 26.0 8.8 25.0
Rail 38.5 0.4 S S S S 17.5
All other Single modes 23.0 0.8 S S S S 9.4
Multiple modes 11.6 1.7 30.6 0.4 47.5 3.4 7.6
Parcel, USPS or courier 14.0 2.0 17.4 0.1 20.7 0.5 7.7
All other multiple modes 40.9 0.4 S S S S 23.3
Other and unknown modes 31.4 0.8 S S S S 23.9

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 S S S S 46.0 S
Single modes S S S S 48.7 4.0 S
Truck S S S S S S 27.9
Rail S S S S S S 31.6
All other Single modes S S S S S S 27.9
Multiple modes
Parcel, USPS or courier
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 23.1 21.5 40.1 S
Single modes 22.8 1.1 21.2 0.4 39.2 0.6 S
Truck 21.8 1.7 19.8 2.2 34.8 3.4 S
Rail S S S S S S 29.9
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 30.9
Parcel, USPS or courier S S S S S S 30.9
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 22.7 26.9 42.4 17.6
Single modes 18.0 2.7 26.9 42.4 18.7
Truck 22.0 8.6 12.5 12.0 26.1 14.3 17.4
Rail 46.5 0.8 47.0 0.4 S S 26.5
All other Single modes S S S S S S S
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 48.4 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 18.7 18.7 32.2 17.0
Single modes 18.8 0.2 18.7 0.1 32.2 1.6 19.5
Truck 16.9 2.5 18.4 0.8 26.7 7.5 19.2
Rail 48.3 2.5 48.0 0.8 S S 26.0
All other Single modes
Multiple modes S S S S S S 31.8
Parcel, USPS or courier S S S S S S 31.8
All other multiple modes
Other and unknown modes S S S S S S 31.6

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 13.5 S S S S 17.4
Single modes 15.8 3.8 S S S S 24.2
Truck 16.8 5.4 49.6 2.2 S S 19.8
Rail 39.9 0.7 S S S S 23.3
All other Single modes 32.0 3.3 40.3 0.2 41.4 1.1 7.2
Multiple modes 36.4 3.4 S S S S 15.2
Parcel, USPS or courier 40.3 3.4 S S 47.5 0.3 14.5
All other multiple modes S S S S S S 29.9
Other and unknown modes 48.9 0.5 44.3 0.2 44.5 0.1 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 17.5 18.6 24.3 5.0
Single modes 24.2 8.4 19.4 3.1 25.0 5.2 11.1
Truck 24.3 8.5 18.8 3.4 20.9 7.4 11.7
Rail S S S S S S 28.4
All other Single modes S S S S S S 20.0
Multiple modes 32.7 8.0 35.5 2.6 34.1 5.1 4.6
Parcel, USPS or courier 32.7 8.0 35.5 2.6 34.1 5.1 4.6
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 45.3 1.7 S S 40.2

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 16.5 17.1 38.7 30.4
Single modes 16.6 3.8 17.4 1.3 40.3 2.5 37.6
Truck 17.8 5.1 17.5 1.7 41.3 4.6 S
Rail 38.0 0.4 38.3 40.8 1.0 24.2
All other Single modes S S S S S S 16.5
Multiple modes 28.0 3.7 45.8 0.7 S S 17.0
Parcel, USPS or courier 30.3 3.2 45.6 0.4 35.8 2.2 17.2
All other multiple modes S S S S S S 30.0
Other and unknown modes S S 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 21.9 23.1 27.0 12.2
Single modes 22.4 8.9 31.5 8.9 34.9 7.9 23.2
Truck 22.3 8.4 32.2 8.8 37.0 7.1 23.4
Rail 46.2 0.2 44.6 0.5 44.6 2.1 25.8
All other Single modes 38.5 1.1 S S S S 16.8
Multiple modes 35.3 8.5 36.9 7.0 38.4 7.7 7.9
Parcel, USPS or courier 35.8 8.6 39.7 7.1 42.7 7.8 7.9
All other multiple modes S S S S S S 37.8
Other and unknown modes 46.9 4.1 46.1 5.5 S S 28.0

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 38.1 38.2 34.2 17.3
Single modes 41.9 4.4 41.0 4.5 39.0 10.3 27.5
Truck 42.3 4.5 41.4 4.3 40.2 9.5 32.7
Rail S S S S S S 30.0
All other Single modes S S S S S S 20.2
Multiple modes 35.4 2.5 S S S S 12.9
Parcel, USPS or courier 35.8 2.6 S S S S 12.9
All other multiple modes S S S S S S 28.1
Other and unknown modes S S S S S S 27.2

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 47.6 S S 42.8 23.4
Single modes S S S S 41.8 3.2 28.5
Truck 48.7 19.6 S S 49.7 9.8 S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 30.6
Parcel, USPS or courier S S S S S S 30.6
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.