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 12.4 27.6 25.9 15.3
Single modes 14.5 2.7 27.0 0.7 26.4 0.8 20.1
Truck 19.3 5.3 27.2 0.8 28.3 3.6 19.9
Rail S S S S S S 24.7
All other Single modes 24.3 4.3 S S S S 6.6
Multiple modes 18.7 2.7 20.2 0.2 16.7 0.8 6.5
Parcel, USPS or courier 18.9 2.7 22.9 0.2 20.0 0.8 6.5
All other multiple modes S S S S S S 25.3
Other and unknown modes S S S S 30.7 0.2 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 30.4 33.2 36.6 S
Single modes 30.5 10.5 33.2 10.5 36.8 10.4 S
Truck 30.5 10.5 33.2 10.5 36.8 10.4 S
Rail
All other Single modes
Multiple modes S S S S S S S
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 S S S S S S 31.5

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 17.4 22.0 25.6 S
Single modes 15.8 1.9 22.0 0.2 25.6 0.5 S
Truck 15.9 1.9 21.5 2.2 25.1 5.8 S
Rail 49.5 0.2 S S S S 28.5
All other Single modes
Multiple modes S S S S S S 31.0
Parcel, USPS or courier S S S S S S 31.0
All other multiple modes
Other and unknown modes S S S S S S 29.4

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 46.8 S S S S S
Single modes 48.9 6.0 S S S S S
Truck 49.3 6.9 S S S S S
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 32.5
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 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 21.6 46.7 39.2 48.4
Single modes 21.9 1.5 40.0 4.1 40.1 1.7 36.4
Truck 21.9 1.5 40.0 4.1 40.1 1.7 36.5
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 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 28.3 37.5 44.5 20.6
Single modes 32.5 5.8 37.8 6.6 46.5 12.9 49.1
Truck 32.6 5.9 38.0 6.5 S S 49.5
Rail
All other Single modes S S S S S S 26.8
Multiple modes 32.8 5.8 35.7 6.8 44.1 9.1 19.0
Parcel, USPS or courier 33.1 5.8 37.4 6.8 39.4 8.6 19.5
All other multiple modes S S S S S S 28.1
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 14.9 37.3 S S 29.3
Single modes 16.6 4.3 37.9 2.5 S S 41.2
Truck 16.6 4.3 37.9 2.5 S S 49.8
Rail
All other Single modes 47.5 S S 46.2 0.1 23.6
Multiple modes 45.1 4.8 37.1 0.9 44.5 8.1 14.0
Parcel, USPS or courier 45.1 4.8 36.8 0.9 45.4 8.1 14.1
All other multiple modes S S S S S S 31.6
Other and unknown modes 32.9 1.7 44.1 2.3 S S 26.8

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 22.3 33.9 14.8 22.2
Single modes 20.6 3.4 34.0 1.4 14.9 0.4 44.7
Truck 20.1 3.7 34.1 1.4 14.9 0.5 47.1
Rail
All other Single modes S S S S S S 17.0
Multiple modes 38.0 3.1 27.9 0.2 30.3 0.4 23.2
Parcel, USPS or courier 38.1 3.1 29.1 0.2 34.2 0.3 22.9
All other multiple modes S S S S S S S
Other and unknown modes S S S S 40.1 0.2 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 18.2 33.4 25.2 8.9
Single modes 17.7 4.9 35.3 8.3 28.4 4.9 15.6
Truck 21.3 5.4 36.7 12.5 34.1 12.6 24.2
Rail S S S S S S 31.6
All other Single modes 25.1 6.1 31.6 5.3 30.3 9.0 6.6
Multiple modes 24.6 4.7 30.4 5.5 35.3 4.0 6.3
Parcel, USPS or courier 24.6 4.7 30.4 5.5 35.3 4.0 6.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 44.4 3.0 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 38.8 S S S S 29.8
Single modes 40.2 2.5 S S S S 19.2
Truck 40.6 2.5 S S S S 21.0
Rail
All other Single modes S S S S S S 24.3
Multiple modes 45.0 2.5 S S 49.8 1.1 14.3
Parcel, USPS or courier 44.1 2.4 S S 48.4 1.1 14.4
All other multiple modes S S S S S S 29.8
Other and unknown modes S S S S S S 27.8

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 40.6 34.7 45.6 S
Single modes 42.0 10.2 34.7 7.8 46.2 10.1 S
Truck 42.8 13.4 34.8 7.7 46.3 9.6 S
Rail
All other Single modes S S S S S S 29.8
Multiple modes S S S S S S 28.3
Parcel, USPS or courier S S S S S S 28.3
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.