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 16.9 34.6 24.3 11.9
Single modes 19.8 2.8 36.2 2.6 27.0 4.5 18.2
Truck 20.9 3.0 27.9 3.8 28.3 5.4 19.8
Rail 34.3 1.3 S S 29.6 4.5 S
All other Single modes 23.4 0.2 S S S S 4.0
Multiple modes 14.3 2.7 27.8 0.2 36.0 1.5 8.0
Parcel, USPS or courier 15.5 2.8 20.7 0.1 26.3 0.5 8.0
All other multiple modes S S 48.4 0.2 S S S
Other and unknown modes 26.9 0.5 44.3 2.6 39.9 4.4 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 S S S S S S 37.3
Single modes S S S S S S 36.8
Truck S S S S S S 36.8
Rail
All other Single modes
Multiple modes S S S S S S 27.8
Parcel, USPS or courier S S S S S S 27.8
All other multiple modes
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 24.5 25.8 29.2 S
Single modes 24.5 1.2 25.9 0.5 29.4 1.0 S
Truck 24.5 1.2 25.9 0.5 29.4 1.0 S
Rail
All other Single modes
Multiple modes S S S S S S 33.0
Parcel, USPS or courier S S S S S S 33.0
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 20.1 30.4 28.5 26.0
Single modes 20.6 1.4 31.7 4.5 29.0 1.4 32.5
Truck 15.4 5.6 33.4 6.8 30.3 5.2 30.3
Rail S S S S S S 27.2
All other Single modes S S S S S S S
Multiple modes S S S S S S 31.4
Parcel, USPS or courier S S S S S S 31.4
All other multiple modes
Other and unknown modes S S S S S S 29.3

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 17.6 18.2 19.4 25.4
Single modes 17.6 18.2 19.4 25.4
Truck 17.6 18.2 19.4 26.4
Rail
All other Single modes S S S S S S 31.6
Multiple modes
Parcel, USPS or courier
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 14.1 S S 47.5 11.8
Single modes 14.7 2.5 S S 49.4 3.2 18.7
Truck 15.7 3.2 S S S S 18.2
Rail S S S S S S 29.0
All other Single modes 48.1 0.5 34.8 48.8 20.5
Multiple modes 19.3 2.8 45.6 1.1 S S 10.2
Parcel, USPS or courier 21.6 3.0 21.1 0.8 22.9 1.2 10.2
All other multiple modes S S S S S S 25.9
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 27.3 38.3 33.7 16.7
Single modes 32.5 5.8 20.0 9.6 32.3 6.3 21.7
Truck 32.8 6.2 22.0 8.7 35.9 7.8 22.3
Rail 47.2 1.2 42.5 4.2 S S 28.5
All other Single modes S S S S S S 28.9
Multiple modes 38.3 5.1 22.7 0.6 36.3 1.3 16.4
Parcel, USPS or courier 38.3 5.1 22.7 0.6 36.3 1.3 16.4
All other multiple modes
Other and unknown modes S S S S S S 26.6

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 8.3 17.9 34.7 10.2
Single modes 11.5 4.3 18.4 2.7 30.8 3.7 15.3
Truck 11.8 4.9 19.0 4.5 27.0 8.1 12.7
Rail 49.9 1.9 S S S S 26.2
All other Single modes 37.2 0.5 S S S S 5.2
Multiple modes 23.9 4.2 20.4 0.3 23.5 0.5 10.0
Parcel, USPS or courier 23.3 4.0 19.0 0.2 23.9 0.5 10.0
All other multiple modes S S S S S S 30.0
Other and unknown modes 32.1 1.3 S S S S 43.3

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 48.2 39.2 49.2 14.0
Single modes S S 41.1 2.8 S S 20.2
Truck S S 38.4 3.5 S S 20.2
Rail 42.0 1.5 S S S S 49.7
All other Single modes 39.2 0.9 39.8 0.1 33.0 0.4 14.5
Multiple modes 35.0 4.8 S S S S 7.8
Parcel, USPS or courier 26.7 4.3 S S S S 7.9
All other multiple modes S S S S S S S
Other and unknown modes 42.4 0.1 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 19.0 S S 47.9 17.3
Single modes 21.8 6.1 S S S S 36.5
Truck 18.0 6.2 43.6 15.6 41.9 12.2 36.5
Rail S S S S S S S
All other Single modes S S 43.0 45.2 22.2
Multiple modes 37.4 6.0 29.3 0.8 30.0 1.6 8.3
Parcel, USPS or courier 37.4 6.0 29.3 0.8 30.0 1.6 8.3
All other multiple modes
Other and unknown modes 37.6 0.3 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 46.6 47.1 34.3
Single modes 48.7 18.9 46.8 10.6 48.9 12.5 S
Truck S S S S S S S
Rail S S S S S S 31.6
All other Single modes S S S S S S 40.2
Multiple modes S S S S S S 25.9
Parcel, USPS or courier S S S S S S 25.9
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.