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 19.4 42.8 14.5 15.3
Single modes 22.3 2.8 43.4 1.1 15.4 1.9 17.1
Truck 23.3 3.4 46.0 4.9 16.6 8.1 14.2
Rail 29.9 0.9 46.1 4.2 41.5 8.2 19.1
All other Single modes 42.5 0.6 S S S S 14.2
Multiple modes 15.1 2.2 15.0 0.2 20.9 1.5 10.9
Parcel, USPS or courier 16.2 2.2 30.6 0.2 44.5 1.0 11.0
All other multiple modes 38.5 0.1 28.5 32.3 1.2 S
Other and unknown modes 25.0 1.7 31.8 0.9 S S 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 S S S S S S 48.3
Single modes S S S S S S 22.2
Truck S S S S S S 22.2
Rail
All other Single modes
Multiple modes S S S S S S 30.3
Parcel, USPS or courier S S S S S S 30.3
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 18.7 19.9 30.9 S
Single modes 20.4 3.1 20.3 2.8 33.0 3.1 S
Truck 21.0 3.4 21.2 3.0 35.3 5.6 S
Rail S S S S S S 28.9
All other Single modes S S S S S S 41.4
Multiple modes S S S S S S 27.2
Parcel, USPS or courier S S S S S S 28.1
All other multiple modes S S S S S S 34.9
Other and unknown modes S S S S S S 29.5

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 S S S S S
Single modes S S S S S S S
Truck S S S S S S S
Rail
All other Single modes S S S S S S 31.6
Multiple modes
Parcel, USPS or courier
All other multiple modes
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 42.4 41.6 42.5 S
Single modes 42.4 10.5 41.6 10.5 42.5 10.5 26.0
Truck 42.4 10.5 41.6 10.5 42.5 10.5 26.0
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 18.5 36.3 27.1 24.3
Single modes 19.0 1.7 36.9 1.2 29.6 4.4 27.1
Truck 20.4 3.9 39.6 6.3 34.9 7.8 25.8
Rail S S S S S S 32.7
All other Single modes S S S S S S 30.0
Multiple modes 30.8 1.5 40.4 1.1 S S 49.0
Parcel, USPS or courier 37.7 1.4 S S 46.7 0.3 49.6
All other multiple modes 40.3 0.7 49.9 0.9 S S 25.0
Other and unknown modes 45.6 0.3 S S S S 41.6

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 47.8 17.7 16.4 11.9
Single modes S S 17.9 0.9 16.8 2.3 17.8
Truck S S 17.9 0.9 16.8 2.3 17.1
Rail
All other Single modes S S S S S S 32.7
Multiple modes 31.8 6.2 32.9 0.6 32.4 2.0 23.4
Parcel, USPS or courier 31.8 6.2 32.8 0.6 32.4 2.0 23.4
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 46.2 0.8 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 15.4 41.2 39.3 18.3
Single modes 16.1 2.9 41.2 0.4 39.1 1.8 26.1
Truck 15.5 4.5 47.7 6.1 28.4 13.0 33.4
Rail S S S S S S 28.1
All other Single modes S S S S S S 25.3
Multiple modes 47.3 2.9 S S S S 16.3
Parcel, USPS or courier 47.6 2.9 43.0 0.4 32.1 1.9 16.4
All other multiple modes S S S S S S 43.8
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 8.1 22.1 33.9 15.9
Single modes 18.6 6.3 29.4 12.0 40.4 12.1 S
Truck 20.4 5.3 29.5 12.1 41.1 12.6 S
Rail
All other Single modes S S 44.8 0.3 S S 24.2
Multiple modes 22.9 7.3 21.1 11.0 20.1 12.1 14.8
Parcel, USPS or courier 22.9 7.3 21.1 11.0 20.1 12.1 14.8
All other multiple modes
Other and unknown modes 39.6 9.6 40.8 13.8 34.5 0.5 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 19.0 S S S S 29.6
Single modes 20.6 5.7 S S S S S
Truck 19.1 5.5 32.1 12.5 32.5 18.1 S
Rail S S S S S S 28.7
All other Single modes S S S S S S 27.5
Multiple modes 39.8 5.7 19.5 1.0 31.5 1.3 19.3
Parcel, USPS or courier 40.2 5.8 19.6 1.0 34.6 1.2 19.8
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 31.4

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 38.7 42.3 S S 24.1
Single modes 46.4 14.0 49.8 9.8 S S 48.3
Truck 47.1 13.2 49.8 9.8 S S 45.1
Rail
All other Single modes S S S S S S 31.0
Multiple modes S S S S S S 29.3
Parcel, USPS or courier S S S S S S 29.3
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.