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 10.3 15.3 14.4 16.5
Single modes 11.1 1.7 15.4 1.0 15.3 2.1 23.5
Truck 10.3 3.6 20.2 5.4 13.6 2.4 16.7
Rail 22.8 2.0 21.0 2.4 24.6 5.7 10.3
All other Single modes 19.9 2.7 21.7 5.8 28.7 5.8 13.5
Multiple modes 26.4 1.5 S S 44.2 2.2 9.0
Parcel, USPS or courier 32.3 1.6 29.9 40.5 9.0
All other multiple modes S S S S 46.7 2.2 20.5
Other and unknown modes 15.3 0.5 38.1 0.3 47.3 0.7 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 28.0 24.7 S S S
Single modes 29.1 4.8 24.7 5.2 S S S
Truck 32.0 10.3 28.5 13.3 S S S
Rail S S S S S S 30.8
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
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 15.0 19.0 25.1 S
Single modes 15.5 2.1 19.1 2.0 26.0 6.3 S
Truck 15.1 2.1 20.5 4.5 28.0 7.5 S
Rail S S S S S S 24.3
All other Single modes S S S S S S 32.1
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S 31.5
All other multiple modes S S S S S S 40.9
Other and unknown modes S S S S S S 29.1

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 46.3 S S S S S
Single modes 46.5 5.7 S S S S S
Truck 46.5 5.7 S S S S S
Rail
All other Single modes
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 S S S S S S 31.6

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 30.5 28.2 26.6 S
Single modes 31.9 4.2 29.6 4.4 29.5 8.1 S
Truck S S S S 46.4 4.4 S
Rail 33.4 0.8 30.8 4.3 22.3 7.5 20.4
All other Single modes 24.4 6.7 26.0 5.7 39.0 8.6 S
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 29.1
Other and unknown modes 40.1 0.3 45.9 0.4 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 16.1 30.7 24.6 18.3
Single modes 15.7 1.6 30.5 1.2 25.7 3.3 19.5
Truck 20.5 6.4 42.4 3.5 19.3 4.2 23.4
Rail 21.5 4.4 22.0 4.7 31.4 6.2 6.9
All other Single modes 30.4 6.0 36.2 5.8 20.5 2.6 27.1
Multiple modes 42.8 1.3 S S S S 18.5
Parcel, USPS or courier S S S S S S 18.5
All other multiple modes 42.9 0.4 S S S S 34.1
Other and unknown modes 42.7 0.8 41.5 0.1 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 24.1 38.1 27.6 22.3
Single modes 24.8 5.3 41.0 3.6 31.9 4.8 32.8
Truck 25.2 5.5 41.2 5.1 34.8 7.8 33.9
Rail S S S S 38.2 2.7 31.5
All other Single modes S S S S S S 25.1
Multiple modes 35.2 4.1 33.1 0.9 41.1 1.5 15.2
Parcel, USPS or courier 35.5 3.9 35.9 0.9 S S 15.4
All other multiple modes S S S S S S 30.0
Other and unknown modes S S S S 47.7 4.5 34.8

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 20.8 35.2 26.1 21.0
Single modes 19.4 1.9 34.2 3.0 25.5 2.1 18.1
Truck 20.1 2.3 35.7 5.0 30.6 8.2 19.9
Rail 28.4 0.3 24.2 0.6 23.2 1.7 21.2
All other Single modes 46.6 2.1 S S S S 14.9
Multiple modes 41.6 1.3 24.9 26.7 0.2 29.0
Parcel, USPS or courier 41.7 1.3 24.9 26.2 0.2 29.0
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 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 28.1 36.9 34.5 26.3
Single modes 31.3 7.9 38.4 3.4 35.1 3.7 34.5
Truck 35.1 8.0 45.8 8.4 39.0 11.1 S
Rail S S S S S S 26.1
All other Single modes 22.6 2.1 38.5 0.5 39.0 1.1 14.7
Multiple modes S S 41.0 3.0 S S 13.5
Parcel, USPS or courier S S 41.0 3.0 S S 13.5
All other multiple modes
Other and unknown modes 45.5 2.9 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 21.9 21.9 16.6 21.3
Single modes 25.5 5.2 22.5 2.5 15.5 3.5 26.1
Truck 26.8 5.7 22.6 2.6 14.4 4.9 25.3
Rail 44.0 0.2 38.4 0.3 38.6 2.9 23.6
All other Single modes S S S S S S 28.8
Multiple modes 46.1 3.9 S S 48.0 3.0 24.1
Parcel, USPS or courier 47.8 4.0 S S 45.3 2.1 25.8
All other multiple modes S S S S S S 32.3
Other and unknown modes 48.2 2.5 S S S S 45.0

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 35.8
Truck S S S S S S 40.3
Rail S S S S S S 32.9
All other Single modes S S S S S S 31.5
Multiple modes S S 39.2 0.3 S S S
Parcel, USPS or courier S S 39.2 0.3 S S S
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.