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 6.1 8.9 10.0 10.8
Single modes 7.7 2.3 10.1 3.3 10.7 4.8 16.4
Truck 9.2 3.3 19.3 4.2 37.3 4.8 18.4
Rail 22.2 1.8 9.0 2.7 19.7 4.5 9.9
All other Single modes 27.4 1.2 25.5 2.6 30.4 5.8 4.2
Multiple modes 20.5 2.1 15.1 3.3 17.2 4.9 4.1
Parcel, USPS or courier 23.2 1.8 19.0 19.0 4.0
All other multiple modes 27.3 0.8 15.1 3.3 17.2 5.0 18.6
Other and unknown modes S S S S 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 14.6 17.6 23.7 22.7
Single modes 13.7 2.4 17.5 1.8 23.9 1.4 21.4
Truck 17.2 6.2 22.2 6.8 26.3 8.0 25.5
Rail 35.6 4.2 26.8 4.2 29.1 6.8 15.4
All other Single modes S S S S S S 26.0
Multiple modes S S S S S S 28.3
Parcel, USPS or courier S S S S S S 30.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 29.6

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 34.4 S S S S S
Single modes 34.4 S S S S S
Truck 40.3 6.8 28.2 11.0 35.4 14.8 S
Rail S S S S S S 16.9
All other Single modes
Multiple modes S S S S S S 28.0
Parcel, USPS or courier S S S S S S 28.0
All other multiple modes
Other and unknown modes S S S S S S 30.0

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 11.1 9.2 11.0 22.3
Single modes 14.8 7.1 15.3 6.0 17.6 7.0 S
Truck 48.9 2.4 43.7 5.6 45.7 0.6 25.8
Rail 18.8 6.5 11.9 5.4 21.9 5.2 13.2
All other Single modes S S S S S S 29.8
Multiple modes 17.4 7.1 15.4 6.0 17.6 7.0 S
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes 17.4 7.1 15.4 6.0 17.6 7.0 4.4
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 48.5 S S S S 23.9
Single modes 48.5 S S S S 23.9
Truck 48.5 S S S S 23.9
Rail
All other Single modes
Multiple modes
Parcel, USPS or courier
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 19.9 39.4 43.8 16.6
Single modes 19.9 1.8 39.2 2.7 43.4 4.3 18.3
Truck 19.9 1.8 39.2 2.7 43.4 4.3 17.9
Rail
All other Single modes S S S S S S 23.8
Multiple modes S S 37.6 2.8 33.9 4.4 12.4
Parcel, USPS or courier S S 38.2 2.8 36.5 4.5 12.1
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 15.5 14.1 10.6 8.9
Single modes 16.7 3.2 14.4 0.8 11.0 1.0 15.6
Truck 20.4 4.5 21.7 4.8 14.0 2.5 18.7
Rail 9.0 3.7 11.7 4.6 10.9 2.4 5.1
All other Single modes S S S S S S 19.2
Multiple modes 26.3 3.4 31.7 0.4 34.5 0.4 6.7
Parcel, USPS or courier 26.5 3.4 33.8 0.4 36.9 0.4 6.6
All other multiple modes S S S S S S 30.7
Other and unknown modes 46.3 1.4 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 17.3 S S S S 18.6
Single modes 18.3 3.1 S S S S 23.6
Truck 18.7 3.2 S S S S 31.9
Rail
All other Single modes 38.7 1.7 42.0 13.7 42.2 14.3 10.7
Multiple modes S S S S S S 6.3
Parcel, USPS or courier S S 40.7 0.3 42.2 0.8 6.7
All other multiple modes S S S S S S 28.3
Other and unknown modes 46.3 1.4 S S S S 38.8

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 11.2 18.8 28.9 18.9
Single modes 13.6 5.8 22.7 8.6 31.1 4.8 S
Truck 16.6 8.0 23.6 8.9 33.3 6.4 S
Rail
All other Single modes 41.0 3.1 38.1 0.7 37.1 2.4 16.7
Multiple modes 32.1 5.3 37.0 3.3 36.7 2.9 5.4
Parcel, USPS or courier 32.1 5.3 37.0 3.3 36.7 2.9 5.4
All other multiple modes
Other and unknown modes S S S S 39.6 4.5 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 25.8 S S S S 9.1
Single modes 27.7 4.7 S S S S 12.6
Truck 26.0 4.5 38.5 19.3 40.7 18.3 12.0
Rail S S S S S S 31.6
All other Single modes S S S S S S 15.5
Multiple modes 31.4 4.2 27.7 1.8 31.3 4.2 9.0
Parcel, USPS or courier 31.4 4.2 27.7 1.8 31.3 4.2 9.0
All other multiple modes
Other and unknown modes S S S S 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 S S S S S S S
Single modes S S S S S S 31.2
Truck S S S S S S 34.6
Rail S S S S S S 29.8
All other Single modes S S S S S S 31.6
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.