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 22.8 14.5 16.5 16.2
Single modes 24.7 3.8 14.6 0.6 17.0 0.8 17.3
Truck 25.0 3.8 14.9 1.2 18.5 3.7 18.1
Rail 41.5 0.4 S S 47.6 3.5 20.7
All other Single modes 38.9 0.6 S S S S 23.0
Multiple modes 13.6 1.8 16.0 24.9 0.8 5.9
Parcel, USPS or courier 13.7 1.7 12.7 21.4 0.4 5.7
All other multiple modes S S 37.6 37.6 0.6 25.9
Other and unknown modes S S S S 47.3 0.4 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 24.4 28.2 34.1 S
Single modes 24.4 28.2 34.1 S
Truck 24.6 0.7 29.2 2.7 34.9 3.5 S
Rail S S S S S S 35.3
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 29.9
Parcel, USPS or courier S S S S S S 29.9
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 36.1 27.0 47.8 40.9
Single modes 36.1 27.0 47.8 40.0
Truck 36.1 27.0 47.8 40.0
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

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 28.5 33.2 S S S
Single modes 28.5 33.2 S S S
Truck 28.5 33.2 S S S
Rail
All other Single modes
Multiple modes
Parcel, USPS or courier
All other multiple modes
Other and unknown modes

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 18.7 39.0 43.4 34.2
Single modes 18.5 0.7 38.7 0.7 43.8 1.2 28.2
Truck 18.6 1.1 38.7 0.6 44.7 6.7 11.5
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 30.5

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 35.5 32.2 30.1 10.5
Single modes 38.3 3.8 32.6 0.8 30.3 0.7 14.2
Truck 39.9 5.8 34.6 4.1 34.1 5.7 17.0
Rail 38.3 1.5 38.5 3.0 39.5 4.5 24.5
All other Single modes 48.0 3.7 S S S S 23.6
Multiple modes 48.4 3.9 37.3 0.7 36.4 0.7 21.5
Parcel, USPS or courier 48.4 3.9 37.3 0.7 36.4 0.7 21.5
All other multiple modes
Other and unknown modes S S S S S S 39.3

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 18.9 19.0 23.1 13.7
Single modes 19.5 3.1 19.0 0.7 23.9 2.6 21.7
Truck 19.3 3.4 19.6 3.2 23.7 5.2 22.6
Rail S S S S S S 49.2
All other Single modes S S S S S S 23.4
Multiple modes 21.7 3.1 29.3 0.7 47.0 2.7 9.8
Parcel, USPS or courier 21.8 3.0 26.1 0.4 27.9 0.5 9.8
All other multiple modes S S S S S S 29.8
Other and unknown modes S S 42.8 0.1 36.7 0.1 36.6

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 27.7 37.9 25.9 S
Single modes 28.9 3.9 38.0 0.8 27.4 3.2 S
Truck 29.0 4.1 38.0 0.8 27.6 3.4 S
Rail
All other Single modes 49.3 1.1 38.1 44.2 0.6 20.9
Multiple modes 37.9 3.5 44.7 0.4 S S 48.4
Parcel, USPS or courier 37.9 3.5 44.7 0.4 S S 48.4
All other multiple modes
Other and unknown modes S S 35.5 0.6 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 S S S S 45.5 44.8
Single modes S S S S 48.4 11.7 S
Truck S S S S 44.1 10.1 S
Rail S S S S S S 29.8
All other Single modes S S S S S S 32.3
Multiple modes 23.9 11.1 25.5 7.1 46.4 9.7 11.9
Parcel, USPS or courier 24.3 11.0 27.2 7.0 32.1 9.3 14.3
All other multiple modes S S S S S S 30.1
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 42.9 S S 47.2 13.1
Single modes 49.2 5.5 S S S S 27.6
Truck 48.3 5.7 S S S S 26.3
Rail
All other Single modes S S 46.6 45.8 0.6 30.0
Multiple modes 32.0 4.5 35.7 3.2 S S 22.7
Parcel, USPS or courier 24.8 3.5 30.8 1.4 36.4 4.9 22.7
All other multiple modes S S S S S S 29.8
Other and unknown modes S S S S S S 31.7

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 S
Truck S S S S S S S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 30.9
Parcel, USPS or courier S S S S S S 30.9
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.