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 40.9 46.0 29.4 43.8
Single modes 42.7 3.5 45.7 1.0 33.8 12.5 27.9
Truck 42.7 3.5 45.7 1.0 33.8 12.5 30.7
Rail S S S S S S 31.6
All other Single modes S S S S S S 26.1
Multiple modes 29.7 3.0 40.0 1.0 S S 14.8
Parcel, USPS or courier 29.7 3.0 40.0 1.0 S S 14.8
All other multiple modes
Other and unknown modes S S S S S S 21.0

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 48.5 S S S S 32.4
Single modes S S S S S S 24.4
Truck S S S S S S 24.4
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 29.9

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 23.1 27.4 29.2 38.0
Single modes 23.4 1.0 28.4 3.0 30.5 3.7 14.7
Truck 23.4 1.0 28.4 3.0 30.5 3.7 14.7
Rail
All other Single modes
Multiple modes
Parcel, USPS or courier
All other multiple modes
Other and unknown modes S S S S S S 30.0

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 S S S S S S 31.6
Single modes S S S S S S 31.6
Truck S S S S S S 31.6
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 S S S S S S 31.6
Single modes S S S S S S 31.6
Truck S S S S S S 31.6
Rail
All other Single modes
Multiple modes
Parcel, USPS or courier
All other multiple modes
Other and unknown modes

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 S S 42.0 S S 37.4
Single modes S S 42.2 10.4 S S 38.1
Truck S S 42.2 10.4 S S 38.1
Rail
All other Single modes
Multiple modes S S S S S S 30.3
Parcel, USPS or courier S S S S S S 30.3
All other multiple modes
Other and unknown modes S S S S S S 28.9

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 38.9 41.6 28.0
Single modes S S 40.1 3.1 47.2 11.7 46.6
Truck S S 40.1 3.1 47.2 11.7 46.8
Rail
All other Single modes S S S S S S 29.9
Multiple modes 45.6 6.8 S S S S 16.8
Parcel, USPS or courier 45.6 6.8 S S S S 16.8
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 32.7 S S S S S
Single modes 42.9 16.8 S S S S S
Truck 42.9 16.8 S S S S S
Rail
All other Single modes
Multiple modes 35.3 12.2 28.6 15.9 28.5 19.4 33.6
Parcel, USPS or courier 35.3 12.2 28.6 15.9 28.5 19.4 33.6
All other multiple modes
Other and unknown modes 40.2 5.2 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 S S 43.8 S S S
Single modes S S 46.2 11.2 S S S
Truck S S 46.2 11.2 S S S
Rail S S S S S S 31.6
All other Single modes S S S S S S 29.9
Multiple modes S S 44.8 11.3 35.9 17.9 35.5
Parcel, USPS or courier S S 44.8 11.3 35.9 17.9 35.5
All other multiple modes
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 30.8 24.6 28.5 35.0
Single modes 34.1 10.8 25.5 12.0 34.8 13.2 S
Truck 35.3 11.8 25.5 14.1 35.1 15.8 22.8
Rail
All other Single modes S S S S S S 31.6
Multiple modes 49.9 6.1 S S S S 27.0
Parcel, USPS or courier 49.9 6.1 S S S S 27.0
All other multiple modes
Other and unknown modes S S 46.4 10.5 S S 23.7

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 31.6
Truck S S S S S S 31.6
Rail
All other Single modes
Multiple modes S S S S S S 43.7
Parcel, USPS or courier S S S S S S 43.7
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.