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 22.2 20.6 16.4 27.5
Single modes 24.5 5.0 20.9 1.2 14.4 3.2 S
Truck 25.9 5.7 22.0 1.8 16.3 5.5 28.2
Rail 26.4 0.5 24.1 1.6 25.0 5.1 14.5
All other Single modes 37.0 1.4 S S S S 20.3
Multiple modes 43.3 4.2 S S S S 14.8
Parcel, USPS or courier S S 37.9 0.2 43.1 0.5 14.9
All other multiple modes S S S S S S 27.1
Other and unknown modes 35.4 1.5 S S S S 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 38.5 S S S
Single modes 46.2 5.3 33.8 6.5 33.8 18.0 S
Truck 46.4 4.9 38.8 7.1 40.7 14.6 S
Rail S S S S S S 27.9
All other Single modes
Multiple modes S S S S S S 31.1
Parcel, USPS or courier
All other multiple modes S S S S S S 31.1
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 46.4 20.9 38.7 S
Single modes 48.6 4.6 20.4 1.6 26.2 12.5 S
Truck 48.6 4.6 20.4 1.6 26.2 12.5 S
Rail
All other Single modes
Multiple modes S S S S S S 29.2
Parcel, USPS or courier S S S S S S 30.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 31.6

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 31.4 29.5 41.4 S
Single modes 32.0 1.8 30.1 2.3 44.1 7.6 S
Truck 40.7 15.5 39.5 16.9 45.9 17.2 S
Rail S S S S S S 29.8
All other Single modes S S S S S S 27.9
Multiple modes S S S S S S 31.8
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 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 34.3 37.0 36.5 34.3
Single modes 34.5 0.3 37.0 36.5 35.6
Truck 34.5 0.3 37.0 36.5 35.6
Rail
All other Single modes
Multiple modes S S S S S S 38.4
Parcel, USPS or courier S S S S S S 38.4
All other multiple modes
Other and unknown modes S S S S S S 31.6

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 30.8 37.6 39.4 S
Single modes 31.1 2.7 38.2 2.2 39.7 2.1 S
Truck 32.0 3.2 37.6 8.0 27.1 14.6 S
Rail S S S S S S 27.8
All other Single modes S S S S S S 25.5
Multiple modes 33.9 2.7 S S S S 20.1
Parcel, USPS or courier 22.8 2.4 36.0 0.3 42.3 0.1 20.2
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 33.2 S S 36.3 15.2
Single modes 20.1 10.0 S S 36.6 0.6 27.4
Truck 21.6 9.8 S S 41.7 7.2 28.8
Rail 46.2 2.6 44.6 4.1 S S 26.9
All other Single modes S S S S S S 26.7
Multiple modes S S S S S S 17.9
Parcel, USPS or courier S S S S S S 17.9
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 15.1 46.2 S S 35.9
Single modes 15.8 2.7 46.3 0.8 S S 40.3
Truck 15.3 3.6 46.4 1.6 48.6 8.7 41.1
Rail S S S S S S 40.5
All other Single modes S S 30.9 S S 48.8
Multiple modes 38.7 2.1 S S S S 18.0
Parcel, USPS or courier 41.7 2.2 35.4 0.4 49.8 0.6 19.0
All other multiple modes S S S S S S 31.5
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 18.9 25.1 S S 22.7
Single modes 19.0 8.7 33.0 11.0 S S 29.6
Truck 28.5 9.5 33.1 10.9 S S S
Rail
All other Single modes 39.3 9.6 S S S S 23.9
Multiple modes 42.3 6.4 34.2 1.6 35.0 5.8 16.3
Parcel, USPS or courier 42.7 6.3 40.1 1.3 48.1 5.6 16.4
All other multiple modes S S S S S S 29.8
Other and unknown modes 48.2 8.9 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 S S S S S S 45.4
Single modes S S S S S S 24.3
Truck S S S S S S 24.3
Rail
All other Single modes S S S S S S 30.4
Multiple modes 37.5 7.9 39.7 5.2 45.3 7.9 20.0
Parcel, USPS or courier 37.5 7.9 39.7 5.2 45.3 7.9 20.0
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 S
Single modes S S S S S S S
Truck S S S S S S S
Rail
All other Single modes
Multiple modes S S S S S S 29.5
Parcel, USPS or courier S S S S S S 29.5
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.