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 7.9 12.3 9.3 19.9
Single modes 7.5 1.6 12.2 0.3 8.5 3.4 15.0
Truck 10.6 2.4 36.4 4.9 20.2 2.4 15.7
Rail 25.1 1.8 14.4 0.5 20.3 2.5 5.4
All other Single modes 10.3 3.1 13.9 5.1 10.7 4.1 S
Multiple modes 21.9 0.9 S S S S 10.2
Parcel, USPS or courier 26.0 0.8 24.3 31.3 10.5
All other multiple modes 48.7 0.2 S S S S 33.3
Other and unknown modes S S 38.0 0.3 S S 30.7

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 24.9 24.4 32.1 S
Single modes 24.9 0.1 24.5 0.2 33.2 9.3 S
Truck 49.9 10.6 S S 48.5 10.3 S
Rail
All other Single modes 30.6 10.6 29.5 11.1 34.5 14.4 19.4
Multiple modes S S S S S S 49.3
Parcel, USPS or courier S S S S S S 30.2
All other multiple modes S S S S S S 32.6
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 16.4 20.9 28.3 33.8
Single modes 15.6 1.4 20.7 0.6 28.7 1.5 34.5
Truck 18.3 11.0 25.6 10.9 31.2 11.5 35.0
Rail S S S S S S 28.2
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 29.0
Parcel, USPS or courier S S S S S S 30.6
All other multiple modes S S S S S S 31.6
Other and unknown modes 46.3 1.0 S S S S 38.0

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 28.1 S S 37.8 45.6
Single modes 29.6 4.1 S S 42.1 10.5 25.2
Truck 29.6 4.1 S S 42.1 10.5 25.2
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 31.8

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 13.6 13.6 14.1 43.1
Single modes 13.5 0.8 13.6 0.9 14.2 5.2 49.9
Truck 18.2 2.8 18.4 1.9 41.1 0.4 27.4
Rail S S S S S S 30.2
All other Single modes 14.8 2.8 14.4 2.0 14.7 5.5 44.1
Multiple modes S S S S S S 28.5
Parcel, USPS or courier
All other multiple modes S S S S S S 28.5
Other and unknown modes S S S S S S 28.1

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 28.7 14.4 15.2 41.1
Single modes 23.1 4.2 14.1 0.4 15.2 0.4 37.0
Truck 38.6 8.4 24.6 5.5 38.9 6.8 36.1
Rail 29.6 5.3 16.0 3.5 16.7 5.6 4.4
All other Single modes 20.4 7.8 24.7 7.5 29.8 8.5 43.3
Multiple modes S S 41.4 0.1 S S 22.5
Parcel, USPS or courier S S 45.7 37.1 0.1 21.6
All other multiple modes S S S S S S S
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 49.1 23.7 32.3 S
Single modes S S 23.3 4.4 31.6 4.4 S
Truck S S 34.3 12.7 16.8 18.5 S
Rail 41.5 8.9 41.4 11.3 42.5 16.5 25.9
All other Single modes S S S S S S 35.5
Multiple modes 39.3 3.9 S S S S 23.9
Parcel, USPS or courier 17.2 1.7 30.9 0.2 22.0 0.5 24.2
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S 48.7 0.2 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 16.6 24.9 24.6 26.4
Single modes 17.5 1.8 25.3 0.8 24.5 0.4 43.1
Truck 18.5 4.0 25.4 4.0 22.1 8.8 45.1
Rail 48.9 3.0 S S 45.7 8.0 38.0
All other Single modes S S S S S S S
Multiple modes 36.1 1.8 37.2 0.1 S S 31.2
Parcel, USPS or courier 36.1 1.8 37.2 0.1 S S 31.4
All other multiple modes S S S S S S 31.6
Other and unknown modes 49.3 1.1 42.6 0.8 S S 25.3

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 17.2 34.2 39.6 24.4
Single modes 22.0 9.5 35.6 7.9 25.6 14.5 S
Truck 26.7 11.5 47.2 12.2 26.5 15.7 S
Rail
All other Single modes 44.7 4.1 S S S S S
Multiple modes 31.7 10.0 S S 48.1 13.7 12.8
Parcel, USPS or courier 31.7 10.0 S S 48.1 13.7 12.8
All other multiple modes
Other and unknown modes S S 47.9 0.7 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 19.0 S S S S 32.5
Single modes 26.4 8.9 S S S S 38.8
Truck 26.4 9.1 43.8 10.1 49.9 19.0 40.2
Rail S S S S S S 31.6
All other Single modes S S S S S S S
Multiple modes 41.1 8.7 S S S S 19.7
Parcel, USPS or courier 41.1 8.7 S S S S 19.7
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 S S S S S S 27.0
Single modes S S S S S S 29.5
Truck S S S S S S 29.7
Rail
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 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.