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 6.7 16.2 19.1 10.2
Single modes 8.8 3.4 17.0 1.7 20.1 1.7 12.2
Truck 8.2 3.2 17.2 2.8 16.8 5.2 14.1
Rail S S S S S S 26.0
All other Single modes 30.6 1.3 S S 37.8 0.8 6.5
Multiple modes 17.6 2.3 23.3 0.1 30.4 0.7 6.8
Parcel, USPS or courier 17.9 2.3 16.7 17.1 0.6 6.8
All other multiple modes 35.3 S S S S 33.7
Other and unknown modes 37.7 1.4 26.6 1.7 34.2 1.4 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 27.9 36.5 48.4 29.2
Single modes 28.0 1.0 38.3 3.2 48.5 0.2 27.5
Truck 27.6 3.9 38.5 3.1 49.1 1.0 27.3
Rail
All other Single modes S S S S S S 25.9
Multiple modes S S S S S S 36.4
Parcel, USPS or courier S S S S S S 29.8
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S S

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 19.1 28.4 32.7 49.5
Single modes 19.1 0.4 28.4 0.3 32.7 0.5 37.0
Truck 19.1 0.6 28.4 0.3 32.7 0.5 10.6
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 30.6
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 47.3 0.3 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 30.0 32.5 44.0 29.5
Single modes 32.4 4.4 38.3 6.9 47.5 6.6 31.2
Truck 32.9 4.4 37.5 6.7 45.8 10.2 31.1
Rail S S S S S S 31.6
All other Single modes
Multiple modes S S S S S S 29.0
Parcel, USPS or courier S S S S S S 29.0
All other multiple modes
Other and unknown modes 44.1 4.4 43.9 6.9 S S 32.5

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 31.2 29.4 20.4 21.2
Single modes 31.5 1.0 29.6 0.8 20.6 0.6 21.4
Truck 31.5 1.0 29.6 0.8 20.6 0.6 21.4
Rail
All other Single modes
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 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 10.5 39.6 32.9 12.2
Single modes 12.7 6.1 41.1 4.2 37.2 7.2 28.3
Truck 12.4 6.3 41.3 4.5 38.1 7.9 29.0
Rail
All other Single modes S S S S S S 33.6
Multiple modes 26.1 5.3 27.2 3.5 32.5 6.8 4.4
Parcel, USPS or courier 26.0 5.3 27.2 3.5 32.1 6.8 4.4
All other multiple modes S S S S S S 29.9
Other and unknown modes S S 37.6 0.9 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 14.9 27.8 31.5 12.8
Single modes 19.7 4.8 28.6 2.0 33.8 3.9 23.3
Truck 19.7 4.7 28.8 2.0 34.2 3.7 24.5
Rail S S S S S S 30.0
All other Single modes S S S S S S 22.0
Multiple modes 20.5 4.1 41.6 1.9 S S 4.6
Parcel, USPS or courier 20.6 3.9 19.6 1.7 17.9 2.9 4.6
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 32.7 0.4 35.1 0.3 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 18.2 41.5 34.0 30.7
Single modes 22.1 3.5 43.0 5.0 34.8 5.6 29.9
Truck 23.4 4.4 44.8 5.6 36.8 7.0 28.0
Rail S S S S S S 41.0
All other Single modes 37.2 1.6 39.5 40.4 0.3 8.1
Multiple modes 20.8 2.7 26.6 0.2 17.5 1.8 11.4
Parcel, USPS or courier 20.8 2.7 26.6 0.2 17.5 1.8 11.4
All other multiple modes S S S S S S 31.6
Other and unknown modes 38.0 2.2 S S 47.8 5.0 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 14.8 23.2 32.3 9.8
Single modes 20.0 7.3 26.6 7.7 36.2 7.5 19.0
Truck 17.6 7.7 27.7 8.1 39.6 8.6 31.7
Rail S S S S S S 31.6
All other Single modes 44.0 3.1 S S 40.0 4.3 7.2
Multiple modes 32.6 4.8 28.5 1.4 35.8 2.7 6.8
Parcel, USPS or courier 33.0 4.8 30.0 1.4 38.6 2.8 6.8
All other multiple modes S S S S S S 31.3
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 23.7 44.5 S S 26.0
Single modes 26.6 4.0 45.6 3.6 S S 47.4
Truck 26.4 3.4 32.3 8.1 34.8 14.9 29.3
Rail S S S S S S 28.8
All other Single modes S S S S S S 20.6
Multiple modes 28.3 3.8 S S S S 13.3
Parcel, USPS or courier 29.6 3.6 32.3 0.5 19.6 3.0 13.3
All other multiple modes S S S S S S 31.6
Other and unknown modes 44.8 1.1 49.5 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 34.0 S S S S 26.7
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 29.0
Multiple modes S S S S S S 27.0
Parcel, USPS or courier S S S S S S 27.0
All other multiple modes
Other and unknown modes S S S S S S 30.2

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.