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 7.3 17.0 15.4 17.0
Single modes 7.3 2.4 16.5 0.8 15.5 1.1 21.0
Truck 6.8 2.0 19.9 3.7 9.3 7.1 16.6
Rail 33.4 1.8 22.8 3.8 27.7 7.6 13.7
All other Single modes 26.1 1.8 S S S S 5.9
Multiple modes 16.1 0.9 S S S S 14.9
Parcel, USPS or courier 15.7 0.8 24.4 18.5 14.9
All other multiple modes S S S S S S S
Other and unknown modes 40.3 1.9 28.7 0.8 36.7 0.6 27.6

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 10.1 22.2 23.6 S
Single modes 10.4 1.6 20.5 1.1 23.4 1.5 S
Truck 10.3 3.2 24.8 6.7 19.4 12.6 S
Rail 23.8 3.2 28.6 6.9 33.0 12.1 S
All other Single modes
Multiple modes S S S S S S 30.2
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S S

SCTG 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 25.1 35.2 34.7 28.9
Single modes 25.3 1.5 34.2 1.0 33.5 1.1 28.7
Truck 26.6 2.8 36.9 5.3 41.4 7.7 28.4
Rail 25.1 2.7 26.3 5.2 22.8 8.2 12.1
All other Single modes
Multiple modes S S S S S S 30.7
Parcel, USPS or courier S S S S S S 30.7
All other multiple modes
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 46.4 32.9 42.8 44.2
Single modes 47.7 4.7 33.8 3.4 44.5 3.9 45.5
Truck 45.6 4.4 33.6 3.4 39.3 4.6 47.2
Rail S S S S S S 30.5
All other Single modes
Multiple modes 48.8 1.6 S S 48.5 1.6 28.1
Parcel, USPS or courier
All other multiple modes 48.8 1.6 S S 48.5 1.6 28.1
Other and unknown modes S S S S S S 29.9

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 24.5 25.8 27.0 43.1
Single modes 25.7 3.8 25.9 1.1 27.0 42.2
Truck 32.3 9.6 32.9 9.9 20.8 13.5 39.2
Rail S S S S S S 27.9
All other Single modes S S S S S S 30.9
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S S
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 30.4

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 28.0 23.7 33.7 S
Single modes 29.1 6.6 25.0 7.5 33.9 1.9 44.6
Truck 29.4 6.6 26.7 6.8 37.2 7.9 S
Rail 31.5 0.8 33.6 5.7 34.3 8.8 21.3
All other Single modes 36.4 1.0 S S 40.9 0.3 16.9
Multiple modes 43.4 4.9 S S S S S
Parcel, USPS or courier S S S S 37.7 0.5 S
All other multiple modes S S S S S S 31.6
Other and unknown modes 38.4 4.9 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 S S 21.3 36.4 14.1
Single modes S S 22.1 2.2 38.6 3.8 17.8
Truck S S 22.1 2.3 38.6 3.8 20.4
Rail S S S S S S 31.6
All other Single modes S S 44.6 43.0 20.0
Multiple modes 28.0 5.1 31.9 1.0 38.7 3.6 12.4
Parcel, USPS or courier 28.0 5.1 31.9 1.0 38.7 3.6 12.4
All other multiple modes
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 38.2 47.3 47.7 31.2
Single modes 30.6 4.7 47.4 1.3 46.4 1.1 32.7
Truck 29.2 4.8 46.0 4.4 42.5 7.5 34.9
Rail S S S S S S 30.4
All other Single modes S S S S S S 6.9
Multiple modes 32.1 2.4 S S S S 24.6
Parcel, USPS or courier 32.4 2.4 45.0 1.0 40.0 0.6 24.1
All other multiple modes S S S S S S 49.9
Other and unknown modes S S S S S S 46.3

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 13.6 40.1 29.2 27.6
Single modes 18.4 5.4 39.6 5.0 30.6 5.2 23.3
Truck 18.4 6.1 43.3 7.1 30.5 8.4 45.8
Rail S S S S S S 29.2
All other Single modes 32.6 6.5 25.1 0.4 26.3 3.1 4.3
Multiple modes 25.3 2.6 32.5 2.0 36.5 0.4 19.0
Parcel, USPS or courier 26.1 2.6 35.8 2.0 43.8 0.5 19.0
All other multiple modes S S S S S S 30.0
Other and unknown modes S S 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 17.3 31.8 39.2 23.4
Single modes 18.1 5.4 34.5 6.7 41.0 4.3 S
Truck 18.2 5.4 34.5 6.6 41.1 4.2 S
Rail S S S S S S 31.6
All other Single modes S S S S S S 17.8
Multiple modes 35.4 1.9 37.1 0.3 35.8 0.7 11.3
Parcel, USPS or courier 35.4 1.9 37.1 0.3 35.8 0.7 11.3
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 45.6 S S 48.3 31.7
Single modes 48.3 8.8 S S S S 27.2
Truck S S S S S S S
Rail
All other Single modes S S S S S S 24.6
Multiple modes S S S S 42.9 2.0 S
Parcel, USPS or courier S S S S 42.9 2.0 S
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.