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 6.8 18.1 29.6 24.3
Single modes 5.7 4.0 17.7 5.4 34.1 7.2 17.2
Truck 5.2 4.0 16.8 5.5 31.1 7.2 18.0
Rail 30.0 0.7 S S S S 45.4
All other Single modes 23.0 0.1 S S 47.3 14.8
Multiple modes 30.4 3.9 S S S S 9.2
Parcel, USPS or courier 34.4 4.1 27.6 0.1 24.6 0.6 9.1
All other multiple modes S S S S S S 30.4
Other and unknown modes 25.9 0.8 S S S S 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 30.8 S S S S 22.1
Single modes 30.8 S S S S 22.1
Truck 30.5 1.7 S S S S 22.9
Rail S S S S S S 31.6
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 31.6

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 26.6 31.5 35.9 24.2
Single modes 27.2 2.2 31.6 0.6 36.2 1.0 23.7
Truck 29.4 5.9 26.3 6.0 36.2 9.5 25.2
Rail 31.6 4.6 S S S S S
All other Single modes
Multiple modes S S S S S S 29.2
Parcel, USPS or courier S S S S S S 29.2
All other multiple modes
Other and unknown modes S S S S S S 31.2

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 48.8 43.7 40.5
Single modes S S 49.1 1.0 34.9 8.6 26.7
Truck S S 49.1 1.0 34.9 8.6 26.7
Rail
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 S S S S S S 31.6
Other and unknown modes S S S S S S 31.8

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 S S S S S S 23.5
Single modes 44.9 7.8 41.4 7.6 S S 23.5
Truck 44.9 7.8 41.4 7.6 S S 23.5
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 31.6

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 25.7 S S 37.3 29.3
Single modes 25.4 0.8 S S 37.2 0.6 43.5
Truck 25.1 2.2 S S 42.0 7.6 45.2
Rail 33.2 2.0 S S 33.7 7.8 26.3
All other Single modes S S S S S S S
Multiple modes 37.4 0.8 31.4 0.2 47.7 0.6 24.5
Parcel, USPS or courier 37.4 0.8 31.4 0.2 47.7 0.6 24.5
All other multiple modes
Other and unknown modes S S S S S S 44.8

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 25.8 17.3 18.7 17.3
Single modes 27.1 6.7 19.0 3.3 20.1 4.0 25.3
Truck 27.2 6.7 19.0 3.2 20.1 4.0 26.5
Rail
All other Single modes S S S S S S 22.3
Multiple modes 40.6 6.8 S S S S 15.0
Parcel, USPS or courier 40.6 6.8 S S S S 15.0
All other multiple modes
Other and unknown modes 35.4 2.0 34.5 1.7 S S 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 13.4 30.8 41.5 36.3
Single modes 13.2 2.6 30.7 0.2 40.0 1.0 S
Truck 13.2 2.7 27.7 3.9 21.7 9.8 S
Rail S S S S S S 31.2
All other Single modes 49.0 0.5 S S S S 30.1
Multiple modes 43.0 2.6 S S 32.2 0.5 37.1
Parcel, USPS or courier 43.0 2.6 S S 32.2 0.5 37.1
All other multiple modes
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 28.5 47.8 49.9 45.0
Single modes 32.3 11.2 48.4 7.7 S S S
Truck 33.0 11.3 48.5 7.8 S S S
Rail
All other Single modes S S 40.5 0.2 S S 34.2
Multiple modes 47.2 11.4 S S 38.6 11.0 14.8
Parcel, USPS or courier 47.2 11.4 S S 38.6 11.0 14.8
All other multiple modes
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 24.9 S S S S 45.8
Single modes 31.5 9.5 49.2 13.3 S S 20.3
Truck 31.6 9.7 49.2 13.3 S S 20.5
Rail S S S S S S 31.6
All other Single modes S S S S S S 30.3
Multiple modes 40.7 10.1 S S S S 25.4
Parcel, USPS or courier 40.8 10.1 46.5 6.0 S S 25.6
All other multiple modes S S S S S S 31.6
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 S S 49.3 34.1
Single modes S S S S S S S
Truck S S S S S S S
Rail
All other Single modes
Multiple modes S S S S S S 29.1
Parcel, USPS or courier S S S S S S 29.1
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.