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 9.1 14.5 13.2 24.7
Single modes 12.5 3.6 14.7 0.5 13.2 0.6 32.2
Truck 12.8 3.8 11.7 3.1 11.7 7.3 27.3
Rail S S S S 50.0 7.1 S
All other Single modes 36.3 0.5 43.6 44.7 12.7
Multiple modes 17.1 2.6 23.0 20.7 0.1 8.5
Parcel, USPS or courier 17.2 2.6 26.0 23.2 0.2 8.5
All other multiple modes S S S S S S 31.6
Other and unknown modes 24.8 1.4 33.9 0.5 34.4 0.5 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 29.0 S S S S S
Single modes 29.0 1.1 S S S S S
Truck 27.0 5.5 S S 44.5 10.2 S
Rail S S S S S S 31.6
All other Single modes
Multiple modes S S 42.0 S S 25.7
Parcel, USPS or courier S S 42.0 S S 25.7
All other multiple modes
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 22.7 22.5 26.0 S
Single modes 31.1 10.8 30.1 9.9 27.0 2.9 S
Truck 31.1 10.8 30.1 9.9 27.0 2.9 S
Rail
All other Single modes
Multiple modes
Parcel, USPS or courier
All other multiple modes
Other and unknown modes S S S S S S 39.6

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 S S 14.0 27.0 13.8
Single modes S S 14.0 0.5 27.4 1.7 15.1
Truck 16.4 19.0 14.5 2.3 25.2 8.5 14.7
Rail 49.8 2.6 S S S S 28.0
All other Single modes
Multiple modes S S S S S S 31.6
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes
Other and unknown modes S S S S S S 37.0

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 23.2 31.4 37.0 S
Single modes 23.2 31.4 37.0 S
Truck 23.2 31.4 37.0 S
Rail
All other Single modes
Multiple modes S S S S S S 30.4
Parcel, USPS or courier S S S S S S 30.4
All other multiple modes
Other and unknown modes

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 25.4 35.4 37.2 21.5
Single modes 26.5 6.4 34.7 4.7 37.4 5.9 24.7
Truck 25.3 6.0 34.7 4.7 37.3 5.8 29.8
Rail
All other Single modes S S S S S S 27.0
Multiple modes 43.4 6.6 28.7 4.9 23.1 5.9 10.7
Parcel, USPS or courier 43.4 6.6 28.7 4.9 23.1 5.9 10.7
All other multiple modes
Other and unknown modes S S S S S S 31.0

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 19.4 12.8 18.7 24.7
Single modes 21.2 2.4 12.7 0.2 18.6 1.5 29.4
Truck 21.5 2.7 12.7 0.3 19.2 2.2 18.5
Rail
All other Single modes S S S S S S 30.7
Multiple modes 36.8 2.0 S S S S 17.0
Parcel, USPS or courier 36.8 2.0 S S S S 17.0
All other multiple modes
Other and unknown modes 30.7 2.0 23.4 0.2 26.7 0.4 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 8.7 25.5 26.6 30.9
Single modes 10.4 4.8 25.3 0.3 26.7 0.5 33.4
Truck 12.6 6.5 28.2 6.8 20.2 10.9 33.3
Rail S S S S S S 38.7
All other Single modes S S S S S S 30.0
Multiple modes S S S S S S 18.4
Parcel, USPS or courier S S S S 47.1 0.1 18.7
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 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 20.9 S S S S 44.3
Single modes 42.6 9.0 S S S S S
Truck 43.5 7.6 S S S S S
Rail
All other Single modes 49.5 2.4 S S S S 25.9
Multiple modes 20.1 10.2 38.1 11.2 43.1 15.2 14.2
Parcel, USPS or courier 20.1 10.2 38.1 11.2 43.1 15.2 14.2
All other multiple modes
Other and unknown modes 46.1 2.2 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 26.9 28.6 29.2 23.7
Single modes 28.3 6.8 29.1 5.5 31.0 7.0 33.1
Truck 28.3 6.8 29.1 5.5 31.0 7.0 33.4
Rail
All other Single modes S S S S S S 31.6
Multiple modes 40.1 3.9 44.1 0.5 44.7 3.9 15.4
Parcel, USPS or courier 40.1 3.9 44.1 0.5 44.7 3.9 15.4
All other multiple modes
Other and unknown modes S S S S 40.1 4.6 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 29.4 S S S S 36.1
Single modes 34.7 9.6 S S S S 31.4
Truck 40.4 12.4 S S S S S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 29.6
Parcel, USPS or courier S S S S S S 29.6
All other multiple modes
Other and unknown modes S S S S S S S

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.