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 12.1 13.6 11.7 14.6
Single modes 14.4 3.7 13.7 0.5 12.6 1.9 22.3
Truck 15.1 3.9 12.6 4.4 13.3 3.0 23.5
Rail 29.0 0.2 34.8 0.5 37.3 2.8 18.4
All other Single modes 19.4 1.0 30.9 4.3 44.3 1.8 12.8
Multiple modes 24.6 3.3 28.9 0.1 31.4 1.8 6.0
Parcel, USPS or courier 24.8 3.3 30.2 0.1 34.8 1.3 6.0
All other multiple modes 36.2 39.9 36.5 0.7 23.5
Other and unknown modes 27.4 1.1 S S 31.1 0.4 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 36.7 S S 33.8 S
Single modes 37.2 1.7 S S 34.2 0.8 S
Truck 37.2 1.8 S S 34.2 0.8 S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 21.6
Parcel, USPS or courier S S S S S S 21.6
All other multiple modes
Other and unknown modes S S S S S S 31.6

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 25.7 47.0 18.9 S
Single modes 27.8 5.7 49.8 8.8 23.9 8.5 S
Truck 27.8 5.7 49.8 8.8 23.9 8.5 S
Rail
All other Single modes
Multiple modes 47.2 2.1 48.5 3.1 45.3 6.9 18.9
Parcel, USPS or courier 35.7 S S 40.2 30.3
All other multiple modes 48.3 2.1 48.6 3.1 45.4 6.9 26.2
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 28.4 30.2 22.2 9.7
Single modes 28.3 0.1 30.2 22.3 0.1 9.8
Truck 28.3 0.1 30.2 22.3 0.1 9.8
Rail
All other Single modes
Multiple modes
Parcel, USPS or courier
All other multiple modes
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 29.4 28.6 28.4 38.7
Single modes 29.5 0.2 28.7 0.3 28.8 1.3 36.9
Truck 37.1 13.2 35.6 13.3 40.0 11.9 38.4
Rail
All other Single modes 30.9 13.2 31.0 13.2 S S 48.8
Multiple modes S S S S S S 30.2
Parcel, USPS or courier S S S S S S 30.2
All other multiple modes
Other and unknown modes S S S S S S S

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 33.6 17.4 29.5 14.2
Single modes 35.4 5.9 18.0 2.5 29.8 0.8 20.1
Truck 34.8 8.9 20.1 7.6 35.3 8.9 21.4
Rail 42.8 3.6 41.6 6.8 44.8 9.0 25.7
All other Single modes S S S S S S 19.6
Multiple modes 31.1 4.8 41.3 0.3 S S 8.3
Parcel, USPS or courier 31.1 4.8 41.3 0.3 S S 8.3
All other multiple modes
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 13.8 18.9 15.7 15.0
Single modes 15.7 5.6 20.2 2.7 19.9 6.5 26.9
Truck 14.1 5.2 20.2 2.7 20.0 6.3 19.9
Rail S S S S S S 31.6
All other Single modes S S S S 47.8 0.7 19.2
Multiple modes 34.3 5.4 29.9 2.4 40.7 6.0 9.4
Parcel, USPS or courier 34.3 5.4 29.9 2.4 40.7 6.0 9.4
All other multiple modes
Other and unknown modes 44.1 1.0 S S 45.6 1.0 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 14.1 15.7 21.7 19.5
Single modes 15.8 7.1 16.6 2.1 23.7 3.8 40.3
Truck 16.7 6.9 17.9 2.6 28.9 6.2 44.1
Rail 35.2 1.5 41.7 2.4 42.2 6.9 15.9
All other Single modes S S 46.1 S S 26.5
Multiple modes S S S S S S 18.3
Parcel, USPS or courier S S S S S S 18.4
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S 49.3 1.5 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 13.4 S S 24.0 S
Single modes 24.2 9.1 S S 28.2 6.5 S
Truck 25.9 8.2 S S 28.5 6.6 S
Rail
All other Single modes S S S S S S 12.2
Multiple modes 27.2 8.1 41.6 6.0 S S 17.9
Parcel, USPS or courier 27.2 8.1 41.9 6.0 S S 17.7
All other multiple modes S S S S S S 29.8
Other and unknown modes 44.7 3.5 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 16.0 19.0 35.1 28.3
Single modes 17.0 2.8 19.1 1.0 34.5 2.4 S
Truck 17.1 3.0 19.2 1.0 34.6 2.3 S
Rail S S S S S S 27.9
All other Single modes S S S S S S 23.3
Multiple modes 28.4 2.9 42.7 0.5 45.9 2.4 15.9
Parcel, USPS or courier 31.7 3.0 36.7 0.4 43.4 2.2 16.0
All other multiple modes S S S S S S 33.6
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 35.4 38.2 42.5 35.4
Single modes 38.6 7.0 37.3 6.4 43.4 4.8 S
Truck 44.8 9.0 29.1 10.8 33.7 11.3 S
Rail S S S S S S 30.7
All other Single modes
Multiple modes S S S S S S 32.6
Parcel, USPS or courier S S S S S S 32.6
All other multiple modes
Other and unknown modes S S S S S S S

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.