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 15.5 20.4 20.4 10.2
Single modes 16.1 2.1 17.5 2.0 20.6 0.9 8.2
Truck 16.4 2.5 18.2 2.6 22.6 5.0 8.6
Rail 49.8 0.9 S S S S 39.1
All other Single modes 38.9 0.2 S S S S 31.4
Multiple modes 26.2 1.9 33.2 0.3 38.5 0.8 10.4
Parcel, USPS or courier 26.2 1.9 33.3 0.3 38.8 0.8 10.4
All other multiple modes 48.8 S S S S 41.3
Other and unknown modes 35.6 0.7 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 46.5 42.2 48.4 42.4
Single modes 47.5 1.9 42.6 1.2 48.8 0.8 40.7
Truck 47.6 1.9 42.5 1.2 48.5 0.9 41.0
Rail S S S S S S 31.6
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 30.1
Parcel, USPS or courier S S S S S S 30.1
All other multiple modes
Other and unknown modes S S S S S S 44.4

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 47.6 41.6 28.6 24.3
Single modes 48.0 10.0 41.6 0.2 28.7 0.8 S
Truck 48.0 10.0 41.6 0.4 29.2 1.8 S
Rail S S S S S S 31.8
All other Single modes
Multiple modes 41.2 10.0 41.0 0.2 40.5 0.8 21.3
Parcel, USPS or courier 41.2 10.0 41.0 0.2 40.5 0.8 21.3
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 27.2 23.4 S S 21.0
Single modes 28.1 2.6 23.5 1.0 S S 20.4
Truck 28.4 2.6 23.3 1.1 S S 20.4
Rail S S S S S S 31.5
All other Single modes
Multiple modes
Parcel, USPS or courier
All other multiple modes
Other and unknown modes S S S S S S S

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 30.2
Single modes S S S S S S 38.9
Truck S S S S S S 38.9
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 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 40.1 S S 18.8
Single modes S S 41.0 4.2 S S 18.2
Truck S S 41.3 4.3 S S 18.3
Rail S S S S S S 25.6
All other Single modes S S S S S S 33.1
Multiple modes S S S S S S 43.1
Parcel, USPS or courier S S S S S S 43.0
All other multiple modes S S S S S S 29.8
Other and unknown modes S S S S S S 38.7

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 38.1 21.7 26.7 14.0
Single modes 41.4 6.2 22.1 1.8 28.1 5.2 16.1
Truck 41.5 6.3 22.1 1.8 28.2 5.3 17.3
Rail S S S S S S 42.2
All other Single modes S S S S S S 26.0
Multiple modes 42.0 6.3 S S S S 12.9
Parcel, USPS or courier 42.0 6.3 S S S S 12.9
All other multiple modes S S S S S S 31.6
Other and unknown modes 43.8 0.7 S S S S 46.5

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 17.2 S S 16.7 24.7
Single modes 17.0 1.6 S S 17.0 1.3 27.3
Truck 17.3 2.2 S S 17.7 2.9 27.1
Rail S S S S 47.3 2.8 30.6
All other Single modes S S S S S S 19.2
Multiple modes 41.8 1.7 46.4 0.2 S S 30.2
Parcel, USPS or courier 41.9 1.8 46.8 0.2 S S 30.0
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 47.3

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 17.3 35.4 S S 29.3
Single modes 16.9 3.2 36.4 2.4 S S 30.9
Truck 19.0 6.6 30.3 12.0 36.6 15.9 32.5
Rail S S S S S S 24.6
All other Single modes S S S S S S 38.5
Multiple modes 39.5 2.6 38.2 2.2 39.1 3.5 21.6
Parcel, USPS or courier 39.5 2.6 38.2 2.2 39.1 3.5 21.6
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 17.0 30.8 28.9 23.4
Single modes 18.0 1.7 31.0 0.3 29.4 0.5 33.4
Truck 18.1 1.7 31.1 0.4 29.5 0.7 34.2
Rail
All other Single modes S S S S S S 23.6
Multiple modes 25.0 1.5 23.7 0.2 14.0 0.5 15.4
Parcel, USPS or courier 25.0 1.5 23.7 0.2 14.0 0.5 15.4
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 33.2
Single modes S S S S S S 34.0
Truck 41.9 18.0 S S S S 35.4
Rail S S S S S S 31.6
All other Single modes
Multiple modes S S S S S S 33.8
Parcel, USPS or courier S S S S S S 33.8
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.