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 10.1 22.4 12.8 13.3
Single modes 11.6 2.4 22.8 0.6 13.0 0.6 14.1
Truck 16.2 6.4 23.7 3.1 12.6 7.6 16.4
Rail 40.4 6.3 23.5 2.4 24.0 5.8 10.2
All other Single modes 42.7 0.8 S S S S 7.6
Multiple modes 13.4 2.1 33.2 0.2 31.6 0.5 11.7
Parcel, USPS or courier 13.4 2.1 39.9 0.2 38.6 0.5 11.7
All other multiple modes S S S S S S 38.1
Other and unknown modes 24.8 0.7 34.9 0.6 41.3 0.6 43.9

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 30.7 36.5 37.2 24.0
Single modes 29.7 1.2 36.2 0.4 37.4 0.9 25.0
Truck 31.9 11.4 39.4 11.8 35.3 15.3 27.6
Rail 29.4 12.0 36.0 11.0 34.1 12.6 26.5
All other Single modes S S S S S S 27.9
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 30.1

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 23.4 16.1 30.7 S
Single modes 23.8 1.7 16.6 1.8 30.9 0.5 S
Truck 23.5 2.0 16.1 1.9 29.5 2.8 S
Rail S S S S S S 26.9
All other Single modes S S S S S S 29.9
Multiple modes S S S S S S 36.8
Parcel, USPS or courier S S 40.8 40.3 17.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 24.7

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 22.9
Single modes S S S S S S 22.9
Truck S S S S S S 22.9
Rail
All other Single modes
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 S S 41.4 41.8 25.6
Single modes S S 41.4 41.8 26.1
Truck S S 41.4 41.8 26.1
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 14.2 13.7 30.3 14.8
Single modes 11.9 5.5 14.1 1.2 30.8 1.7 17.3
Truck 12.1 6.5 16.1 5.1 34.7 8.1 23.4
Rail 47.0 3.5 44.8 5.1 45.9 7.8 22.5
All other Single modes S S S S S S 27.9
Multiple modes 48.1 5.4 34.4 1.1 46.7 1.7 13.7
Parcel, USPS or courier 48.1 5.4 32.2 0.9 41.4 1.4 13.7
All other multiple modes S S S S S S 31.6
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 11.7 10.4 21.8 12.4
Single modes 15.6 5.6 13.5 6.5 23.4 5.7 46.6
Truck 15.8 5.4 13.5 6.4 23.6 5.6 35.2
Rail
All other Single modes 46.7 0.6 40.1 S S 14.1
Multiple modes 16.7 4.4 23.0 0.9 26.3 4.7 5.2
Parcel, USPS or courier 16.7 4.4 23.0 0.9 26.3 4.7 5.2
All other multiple modes
Other and unknown modes 40.8 1.9 S S 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 16.6 S S 36.2 39.3
Single modes 18.8 5.5 S S 35.1 0.9 S
Truck 18.9 5.4 S S 34.3 1.3 S
Rail S S S S S S 31.6
All other Single modes S S 36.7 45.3 17.8
Multiple modes S S S S S S 26.7
Parcel, USPS or courier S S 38.9 0.1 48.7 0.3 27.1
All other multiple modes S S S S S S 45.1
Other and unknown modes 44.4 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 25.5 45.2 28.3 14.3
Single modes 31.8 11.6 46.5 5.7 27.5 2.7 14.8
Truck 20.9 10.4 S S 44.7 13.2 29.0
Rail 42.4 14.5 39.0 11.0 38.3 12.9 21.4
All other Single modes S S S S S S 16.0
Multiple modes 30.5 10.3 S S 46.6 1.4 23.4
Parcel, USPS or courier 30.5 10.3 S S 46.6 1.4 23.4
All other multiple modes
Other and unknown modes 35.6 7.0 S S 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 29.7 25.8 31.0 23.6
Single modes 32.3 4.7 26.2 1.0 32.5 3.1 14.8
Truck 32.3 4.7 26.2 1.0 32.5 3.1 15.6
Rail S S S S S S 31.6
All other Single modes S S S S S S 31.6
Multiple modes 41.4 4.7 S S S S 20.9
Parcel, USPS or courier 41.4 4.7 S S S S 20.9
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 45.4

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 S S S S S S 44.7
Single modes S S S S S S 34.3
Truck S S S S S S S
Rail
All other Single modes S S S S S S 30.1
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S 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.