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 5.3 16.0 20.0 14.9
Single modes 6.3 2.8 15.1 2.0 14.8 4.1 22.8
Truck 6.6 3.8 17.5 5.2 13.4 5.4 13.8
Rail 44.4 1.7 24.0 2.6 22.7 2.9 11.4
All other Single modes 31.1 0.5 30.3 3.8 31.1 4.3 7.1
Multiple modes 20.4 2.8 36.1 2.1 39.9 4.2 8.3
Parcel, USPS or courier 15.2 1.7 14.9 23.2 0.1 8.3
All other multiple modes 43.0 2.4 36.8 2.1 40.5 4.3 34.6
Other and unknown modes 15.3 0.4 49.5 0.2 23.1 0.2 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 27.2
Single modes S S S S S S S
Truck S S S S S S 22.8
Rail S S S S S S 26.8
All other Single modes S S S S S S 31.6
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 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 17.7 S S 30.2 43.3
Single modes 19.5 5.6 S S 30.8 3.1 S
Truck 19.5 5.6 S S 31.2 3.2 S
Rail S S S S S S 31.6
All other Single modes
Multiple modes S S S S S S 23.1
Parcel, USPS or courier S S S S S S 24.0
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 31.2

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 27.6 21.5 32.1 S
Single modes 22.9 10.2 22.8 4.6 27.5 7.6 S
Truck 45.5 6.5 41.4 6.5 27.4 1.8 S
Rail 33.0 6.6 31.7 4.5 43.8 2.1 21.5
All other Single modes 27.5 7.6 28.5 6.7 28.8 7.9 10.9
Multiple modes 40.5 10.2 39.4 4.6 45.4 7.6 46.7
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes 40.6 10.2 39.4 4.6 45.4 7.6 9.4
Other and unknown modes S S S S S S 30.1

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 28.4 32.2 42.3 17.1
Single modes 28.6 0.7 32.4 0.5 42.5 0.9 18.5
Truck 29.8 6.0 33.6 6.7 42.5 1.7 18.5
Rail
All other Single modes S S S S S S 29.8
Multiple modes S S S S S S 30.4
Parcel, USPS or courier S S S S S S 30.4
All other multiple modes
Other and unknown modes S S S S S S 30.2

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 16.3 19.4 13.4 16.3
Single modes 16.6 6.9 19.4 1.6 14.5 2.7 31.2
Truck 16.9 6.2 21.8 3.1 15.4 3.7 32.2
Rail 35.3 1.5 32.0 3.6 31.2 4.7 20.3
All other Single modes S S S S S S 24.0
Multiple modes 38.7 6.8 36.1 1.6 40.5 2.4 15.6
Parcel, USPS or courier 38.8 6.8 37.1 1.6 42.6 2.4 15.6
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 20.9 12.1 14.1 28.5
Single modes 21.5 1.5 12.3 0.9 12.8 1.5 48.7
Truck 23.6 3.6 15.3 4.2 19.3 4.9 S
Rail 16.4 3.1 14.3 4.6 12.7 5.7 8.0
All other Single modes S S S S S S 20.6
Multiple modes 18.1 1.4 S S S S 11.9
Parcel, USPS or courier 8.2 0.9 14.1 15.9 11.8
All other multiple modes S S S S S S 29.6
Other and unknown modes 21.4 0.6 44.1 0.4 47.6 0.5 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 13.3 27.8 30.5 17.4
Single modes 14.5 2.6 27.9 1.1 30.7 1.7 15.5
Truck 13.2 3.6 17.0 9.6 21.8 11.2 16.6
Rail S S S S S S 25.8
All other Single modes S S S S S S 9.4
Multiple modes 20.4 2.3 47.0 0.2 S S 27.1
Parcel, USPS or courier 20.1 2.3 21.2 0.2 29.8 0.2 27.2
All other multiple modes S S S S S S 28.0
Other and unknown modes 34.0 0.7 33.6 1.0 38.8 1.5 37.6

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 17.2 16.3 18.9 10.9
Single modes 18.6 6.0 17.5 4.5 21.2 8.3 15.8
Truck 14.1 6.4 17.7 4.8 13.9 10.1 8.4
Rail S S S S S S 23.6
All other Single modes 40.0 0.7 43.8 0.5 42.4 1.0 13.8
Multiple modes 38.7 6.2 43.2 4.1 40.7 8.5 6.2
Parcel, USPS or courier 30.2 2.3 26.1 0.2 26.4 0.3 7.0
All other multiple modes 46.3 5.8 45.2 3.9 41.5 8.4 25.0
Other and unknown modes 34.5 1.3 29.8 1.0 39.1 1.8 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 21.3 36.3 36.6 14.3
Single modes 22.9 5.4 36.1 1.9 36.5 2.5 18.0
Truck 22.9 5.4 36.1 1.9 36.5 2.6 17.4
Rail S S S S S S 30.1
All other Single modes S S S S S S 21.6
Multiple modes 33.7 5.6 43.8 1.2 42.2 2.7 11.0
Parcel, USPS or courier 33.7 5.6 43.8 1.2 42.2 2.7 11.0
All other multiple modes S S S S S S 31.6
Other and unknown modes 49.4 0.8 S S S S 28.9

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 32.8 43.6 S S S
Single modes 33.2 3.2 43.6 S S S
Truck 33.2 3.2 43.6 S S S
Rail
All other Single modes
Multiple modes S S S S S S 48.7
Parcel, USPS or courier S S S S S S 48.7
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.