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 7.5 20.9 19.0 9.4
Single modes 7.4 2.6 19.6 6.1 17.4 1.2 14.6
Truck 7.9 2.5 28.2 5.9 26.2 8.4 11.4
Rail 29.8 1.4 21.1 9.9 23.3 8.5 11.0
All other Single modes S S 42.4 0.7 S S 7.0
Multiple modes 18.1 2.6 S S S S 12.1
Parcel, USPS or courier 17.0 2.6 33.4 27.8 12.1
All other multiple modes S S S S S S 27.6
Other and unknown modes 23.9 0.5 45.3 6.0 36.5 0.6 31.5

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 26.9
Single modes S S S S S S 26.9
Truck S S S S S S 26.9
Rail S S S S S S 31.6
All other Single modes
Multiple modes
Parcel, USPS or courier
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 28.8 19.0 28.0 21.8
Single modes 30.7 4.7 19.6 1.5 28.6 6.5 S
Truck 30.6 4.6 19.5 1.5 28.6 6.5 S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 28.4
Parcel, USPS or courier S S S S S S 28.5
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 43.6

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 32.9 S S 45.9 S
Single modes 33.6 3.0 S S 46.0 3.3 S
Truck 34.6 7.7 S S 41.3 10.9 S
Rail S S S S S S 29.8
All other Single modes S S S S S S 27.9
Multiple modes 40.8 1.0 S S S S 21.9
Parcel, USPS or courier 40.8 1.0 S S S S 21.9
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 13.1 16.7 19.3 S
Single modes 14.7 5.1 10.7 7.4 19.7 1.1 S
Truck 16.4 4.8 27.8 7.1 34.6 10.5 S
Rail 26.4 7.9 23.9 12.8 25.6 11.1 9.7
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 39.6 5.1 46.0 7.4 40.2 1.1 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 31.1 S S S S 16.2
Single modes 35.9 13.3 S S S S 41.5
Truck 38.5 12.1 S S S S 46.7
Rail S S S S S S 28.7
All other Single modes S S S S S S 26.3
Multiple modes 32.4 13.2 S S S S 13.1
Parcel, USPS or courier 31.9 13.3 S S S S 13.0
All other multiple modes S S S S S S 30.2
Other and unknown modes 47.9 1.5 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 40.1 30.8 25.4 14.1
Single modes 45.3 7.1 31.8 3.2 27.5 4.8 28.8
Truck 45.3 7.2 31.8 3.2 27.6 4.9 28.9
Rail
All other Single modes S S S S S S 38.2
Multiple modes 48.5 6.2 44.6 1.9 47.7 3.9 8.4
Parcel, USPS or courier 48.9 6.2 47.0 1.9 S S 8.4
All other multiple modes S S S S S S 29.8
Other and unknown modes 31.2 1.3 S S S S 28.4

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 48.2 S S 41.8
Single modes 17.0 5.3 45.3 1.9 S S S
Truck 16.7 6.6 27.7 12.4 26.2 19.5 S
Rail S S S S S S 27.4
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 21.7
Parcel, USPS or courier S S 39.6 S S 20.1
All other multiple modes S S S S S S 32.2
Other and unknown modes 29.9 0.4 S S S S 28.8

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 18.6 42.0 42.4 16.6
Single modes 37.5 8.6 46.2 10.9 S S 21.9
Truck 25.9 8.7 46.7 13.1 S S S
Rail S S S S S S 29.8
All other Single modes S S 49.0 2.1 S S 16.3
Multiple modes 28.9 8.2 27.9 9.2 35.8 9.3 9.7
Parcel, USPS or courier 28.9 8.2 27.9 9.2 35.8 9.3 9.7
All other multiple modes
Other and unknown modes S S S S 48.1 0.2 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 24.7 28.5 30.6 19.0
Single modes 27.5 9.6 31.2 5.0 33.4 5.2 40.3
Truck 27.5 9.6 31.2 5.0 33.4 5.2 42.1
Rail
All other Single modes S S S S S S 29.9
Multiple modes S S S S S S 27.5
Parcel, USPS or courier S S S S S S 27.5
All other multiple modes S S S S S S 34.9
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 44.8 S S S
Single modes 43.6 13.3 49.5 10.8 S S S
Truck 43.6 13.3 49.5 10.8 S S S
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 31.5

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.