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 5.9 20.5 19.3 15.5
Single modes 6.3 2.3 21.1 0.8 18.3 1.8 14.7
Truck 5.8 2.2 22.6 2.8 17.8 3.5 11.9
Rail 26.3 0.5 23.2 1.4 29.8 4.3 21.7
All other Single modes 46.8 0.4 S S 49.3 0.2 9.3
Multiple modes 15.7 1.9 40.8 0.5 S S 10.4
Parcel, USPS or courier 17.0 1.9 17.6 0.1 21.7 0.5 10.4
All other multiple modes S S S S S S 23.0
Other and unknown modes 29.1 1.1 17.5 0.5 34.7 1.5 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 48.1 40.3 S S 43.9
Single modes 48.1 0.2 40.3 0.5 S S 43.9
Truck 49.0 13.6 40.9 15.3 S S 30.2
Rail S S S S S S 28.4
All other Single modes
Multiple modes
Parcel, USPS or courier
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 35.7 23.3 38.9 26.4
Single modes 34.6 1.0 22.1 1.3 30.8 5.7 35.9
Truck 34.6 2.1 19.6 5.7 23.9 12.1 37.4
Rail 47.5 2.0 48.2 5.4 S S 24.2
All other Single modes
Multiple modes S S S S S S 27.6
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 26.9
Other and unknown modes S S S S S S 28.2

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 18.1 30.1 31.6 32.0
Single modes 18.1 0.3 30.2 31.8 0.6 32.3
Truck 18.1 0.3 30.2 31.8 0.6 32.3
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 31.2

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 29.0 38.6 49.6 36.2
Single modes 29.0 0.4 38.6 49.6 38.0
Truck 34.2 11.1 42.0 10.8 45.5 10.5 39.6
Rail S S S S S S 31.6
All other Single modes S S S S S S 26.0
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 36.4 29.9 49.2 24.5
Single modes 31.4 6.9 31.4 6.9 49.7 4.8 49.5
Truck 29.3 8.0 34.3 7.9 36.7 9.8 49.2
Rail S S S S S S 23.6
All other Single modes 35.8 S S S S 25.7
Multiple modes S S 48.6 5.2 40.0 4.5 18.5
Parcel, USPS or courier S S 48.6 5.2 40.0 4.5 18.5
All other multiple modes
Other and unknown modes S S S S S S 31.2

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 16.3 33.7 S S 9.8
Single modes 26.9 10.0 33.8 5.1 S S 17.4
Truck 26.9 10.0 33.8 5.1 S S 17.4
Rail
All other Single modes 34.5 S S 43.4 27.0
Multiple modes 33.7 9.8 S S S S 7.0
Parcel, USPS or courier 35.3 10.0 40.3 5.5 44.7 11.0 7.0
All other multiple modes S S S S S S 29.7
Other and unknown modes S S 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 29.1 S S 26.0 12.7
Single modes 31.2 3.4 S S 28.8 4.4 29.9
Truck 31.2 3.5 S S 29.1 4.4 15.2
Rail S S S S S S 33.2
All other Single modes S S 48.7 47.1 9.9
Multiple modes 44.8 3.0 S S S S 8.5
Parcel, USPS or courier 33.1 1.2 45.6 0.5 44.0 0.7 8.6
All other multiple modes S S S S S S 27.8
Other and unknown modes S S 33.9 2.8 S S 29.5

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 9.2 14.3 15.1 26.4
Single modes 8.2 4.9 16.3 4.5 16.4 4.0 S
Truck 8.5 5.3 16.4 7.7 11.7 9.5 S
Rail 36.4 2.5 41.6 8.5 42.9 9.8 27.4
All other Single modes S S S S S S 12.5
Multiple modes 27.0 3.6 S S 41.4 2.3 22.1
Parcel, USPS or courier 27.0 3.5 S S 44.2 2.1 22.4
All other multiple modes S S S S S S 27.9
Other and unknown modes S S S S S S 37.1

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 16.4 19.0 27.1 27.5
Single modes 17.2 2.8 18.5 0.4 27.4 1.4 43.2
Truck 17.3 3.0 17.3 3.7 27.9 3.1 38.7
Rail 37.9 0.2 48.0 3.7 36.1 3.4 37.5
All other Single modes S S S S S S 31.5
Multiple modes 27.9 2.7 42.8 0.3 34.2 1.0 21.6
Parcel, USPS or courier 27.9 2.7 42.8 0.3 34.2 1.0 21.6
All other multiple modes
Other and unknown modes 44.7 0.4 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 46.1 38.2 S S 23.0
Single modes S S 48.4 15.3 S S 22.1
Truck S S S S S S 22.4
Rail S S S S S S 31.6
All other Single modes
Multiple modes S S S S S S 23.3
Parcel, USPS or courier S S S S S S 23.3
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.