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 14.3 23.1 10.2 29.4
Single modes 15.6 2.0 23.6 1.3 8.9 2.6 S
Truck 15.9 2.7 24.2 2.3 6.3 3.8 44.6
Rail 30.9 0.7 24.2 1.0 26.7 2.9 8.9
All other Single modes 45.5 1.0 49.8 0.9 S S 9.1
Multiple modes 15.0 1.5 29.8 0.4 30.6 2.6 9.5
Parcel, USPS or courier 19.8 1.4 22.2 31.3 0.1 9.9
All other multiple modes 12.5 0.3 31.2 0.5 31.6 2.7 9.3
Other and unknown modes 22.3 0.6 43.7 1.3 24.3 0.3 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 42.9 S S 39.4 47.9
Single modes 44.4 2.8 S S 37.9 5.0 S
Truck 42.6 2.1 S S 33.8 6.3 S
Rail S S S S S S 23.7
All other Single modes S S S S S S 29.8
Multiple modes 27.8 2.0 S S S S 15.6
Parcel, USPS or courier S S S S S S 28.4
All other multiple modes 28.6 1.9 S S S S 11.2
Other and unknown modes 42.4 2.3 39.3 0.6 46.0 1.3 25.0

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 13.4 11.8 16.7 18.8
Single modes 13.1 1.4 12.2 1.0 17.2 2.1 25.9
Truck 15.1 3.6 13.3 3.7 15.6 5.7 25.4
Rail 36.7 3.8 36.8 3.3 38.7 5.0 9.2
All other Single modes S S S S S S 27.9
Multiple modes 34.7 1.2 18.9 0.9 18.9 2.2 11.9
Parcel, USPS or courier S S S S S S 16.3
All other multiple modes 31.7 1.0 19.1 0.9 19.0 2.2 4.2
Other and unknown modes S S S S S S S

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 26.0 S S 37.7 S
Single modes 26.2 10.5 S S 38.1 10.4 S
Truck 38.2 13.8 S S S S S
Rail 46.9 11.8 48.1 8.3 42.4 11.7 26.2
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
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 30.5 28.1 31.6 33.7
Single modes 31.3 4.7 31.2 5.3 32.9 10.6 15.1
Truck 34.3 8.7 36.5 10.3 42.1 14.0 14.8
Rail 47.8 0.2 47.3 0.2 44.0 3.1 26.1
All other Single modes S S S S S S 27.5
Multiple modes S S 49.1 5.1 43.1 10.6 S
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S 49.1 5.1 43.1 10.6 S
Other and unknown modes S S S S S S S

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 36.0 S S 40.4 S
Single modes 36.6 7.5 S S 40.6 5.8 S
Truck 37.0 7.9 S S 44.4 9.6 S
Rail S S S S S S 26.1
All other Single modes S S S S S S 30.0
Multiple modes 45.7 7.4 41.4 0.6 S S 13.5
Parcel, USPS or courier 46.6 7.4 34.4 0.6 26.3 5.3 13.5
All other multiple modes S S S S S S 27.9
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 S S 17.7 18.8 42.9
Single modes S S 17.6 0.7 17.6 2.3 S
Truck S S 18.4 1.4 21.8 5.1 S
Rail 17.0 1.0 16.1 1.4 17.9 5.1 8.0
All other Single modes S S 44.8 44.0 22.2
Multiple modes S S S S S S 12.7
Parcel, USPS or courier S S S S S S 13.1
All other multiple modes S S S S S S 22.2
Other and unknown modes 44.4 1.8 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 16.3 26.1 25.9
Single modes 17.4 5.5 19.0 3.9 28.0 4.3 S
Truck 17.7 5.6 19.1 3.9 28.3 4.2 S
Rail S S 47.4 0.3 42.0 0.5 S
All other Single modes 34.9 0.3 S S 46.5 16.1
Multiple modes 41.0 5.5 29.9 0.1 30.6 1.5 15.2
Parcel, USPS or courier 43.4 5.6 S S S S 15.6
All other multiple modes 48.8 0.2 33.6 34.3 1.4 10.6
Other and unknown modes 28.1 2.3 40.3 3.9 S S 24.4

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 19.1 25.5 27.0 47.5
Single modes 26.9 7.8 26.6 4.4 29.7 3.6 S
Truck 29.8 8.8 27.2 5.8 32.1 7.6 S
Rail S S S S S S 31.6
All other Single modes S S S S S S 12.4
Multiple modes 22.7 6.6 27.2 2.0 31.3 3.8 12.4
Parcel, USPS or courier 23.0 6.7 27.5 1.8 30.4 3.0 12.5
All other multiple modes S S S S S S 23.6
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 11.9 33.0 33.9 16.9
Single modes 11.9 3.2 33.7 1.2 37.4 5.9 28.1
Truck 9.8 3.3 34.1 1.6 37.5 6.6 28.9
Rail S S S S S S 31.6
All other Single modes S S S S S S 24.1
Multiple modes S S 42.2 0.6 38.7 5.0 17.3
Parcel, USPS or courier S S S S S S 17.2
All other multiple modes 33.1 0.4 38.7 0.4 38.3 4.5 18.3
Other and unknown modes S S 39.2 0.7 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 39.4 30.8 S S 28.1
Single modes 40.0 1.4 30.8 S S S
Truck 41.0 7.6 33.5 7.1 S S S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 30.2
Parcel, USPS or courier S S S S S S 30.2
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.