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 7.5 23.0 12.8 25.9
Single modes 4.9 3.1 23.5 0.7 13.5 1.0 S
Truck 6.2 3.2 23.3 6.3 19.4 5.0 35.6
Rail 25.1 2.0 S S 18.7 4.9 10.9
All other Single modes 29.5 1.4 37.2 S S 14.9
Multiple modes 16.5 1.6 24.3 24.4 0.6 6.9
Parcel, USPS or courier 16.6 1.6 31.9 36.5 0.6 6.9
All other multiple modes 35.6 42.1 42.0 0.1 26.5
Other and unknown modes S S 27.2 0.7 44.6 0.8 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 19.6 24.6 S S 24.9
Single modes 19.8 3.4 24.9 0.9 S S S
Truck 20.1 3.3 25.1 1.0 S S S
Rail 46.3 0.8 S S S S 27.0
All other Single modes
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 S S S S S S 36.0

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 20.0 21.5 32.0 S
Single modes 23.4 6.1 24.9 6.7 33.6 3.2 S
Truck 22.7 6.1 25.2 5.7 28.6 5.6 S
Rail S S S S S S 15.4
All other Single modes S S S S S S 31.6
Multiple modes 47.6 3.1 S S S S 18.8
Parcel, USPS or courier 47.6 3.1 S S S S 18.8
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 11.6 20.9 28.0 18.8
Single modes 11.6 0.2 20.9 28.0 0.5 18.5
Truck 14.1 5.3 22.4 3.6 36.5 8.9 17.4
Rail 15.6 5.3 31.7 3.6 16.7 8.7 30.2
All other Single modes
Multiple modes S S S S S S 28.1
Parcel, USPS or courier
All other multiple modes S S S S S S 28.1
Other and unknown modes

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 35.8 46.1 46.8 37.0
Single modes 35.8 46.1 46.8 37.0
Truck 35.8 46.1 46.8 37.0
Rail
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

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 27.2 S S 21.3 47.8
Single modes 26.4 11.4 S S 21.4 0.6 S
Truck 25.9 8.1 S S 21.5 2.5 S
Rail 33.9 7.7 S S 22.7 2.9 16.8
All other Single modes S S S S S S 30.1
Multiple modes S S S S S S 32.3
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 S S 35.9 39.5 37.4

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 24.0 S S 27.4 15.3
Single modes 17.0 5.2 S S 28.7 1.8 46.4
Truck 18.9 5.9 S S 33.6 6.2 45.5
Rail 22.3 1.9 21.5 3.7 22.6 6.2 14.5
All other Single modes S S S S S S 19.3
Multiple modes S S S S S S 7.8
Parcel, USPS or courier S S S S S S 7.7
All other multiple modes S S S S S S 28.9
Other and unknown modes S S 36.8 5.9 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 9.3 46.0 29.0 S
Single modes 10.4 3.0 46.1 0.6 29.8 2.4 S
Truck 9.2 4.4 46.3 2.1 31.7 6.4 S
Rail S S S S S S 31.6
All other Single modes S S S S S S 31.2
Multiple modes 30.4 3.1 46.6 0.3 S S 12.9
Parcel, USPS or courier 30.4 3.1 45.5 0.3 S S 12.8
All other multiple modes S S S S S S 31.6
Other and unknown modes 38.5 0.8 S S 40.8 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 8.5 25.6 25.4 S
Single modes 9.1 5.8 27.0 8.3 29.1 8.9 S
Truck 22.2 8.7 29.8 9.5 35.9 9.5 S
Rail S S S S S S 28.8
All other Single modes 33.2 6.4 S S S S 23.4
Multiple modes 24.6 6.3 S S S S 8.9
Parcel, USPS or courier 24.6 6.3 S S S S 8.9
All other multiple modes
Other and unknown modes 41.9 1.4 44.7 3.7 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 24.2 24.1 16.3
Single modes 9.4 3.7 24.7 1.2 25.6 4.6 S
Truck 9.4 3.7 24.7 1.2 25.9 5.1 S
Rail S S S S S S S
All other Single modes S S 47.4 S S 18.7
Multiple modes 46.8 3.7 S S S S 11.2
Parcel, USPS or courier 47.2 3.7 S S S S 11.2
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S 38.2 0.8 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 33.3 S S S S S
Single modes 32.1 10.2 S S S S 39.0
Truck 38.1 12.6 S S S S 40.6
Rail S S S S S S 31.6
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 37.5
Parcel, USPS or courier S S S S S S 37.5
All other multiple modes
Other and unknown modes S S S S S S 35.5

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.