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 8.0 11.9 6.7 9.3
Single modes 7.9 1.4 12.7 1.7 9.7 4.8 18.9
Truck 8.6 2.5 15.8 3.3 10.1 2.7 20.3
Rail 14.7 0.5 23.3 3.3 13.6 2.6 5.8
All other Single modes 25.4 1.3 26.5 4.5 21.3 6.6 6.9
Multiple modes 11.8 0.9 26.8 1.5 29.2 4.8 3.8
Parcel, USPS or courier 14.6 0.8 22.8 23.2 0.1 3.8
All other multiple modes 20.7 0.4 27.7 1.4 29.8 4.8 28.5
Other and unknown modes 29.5 1.3 39.2 0.5 15.1 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 19.1 20.3 8.7 31.0
Single modes 20.6 4.4 24.4 8.0 16.2 9.6 32.6
Truck 26.7 7.3 31.5 8.5 30.5 2.4 31.0
Rail S S S S 36.4 1.6 23.7
All other Single modes 20.1 7.1 19.9 8.8 19.9 9.9 1.7
Multiple modes 37.0 4.4 35.9 8.0 35.4 9.5 16.8
Parcel, USPS or courier S S S S S S 30.4
All other multiple modes 37.1 4.4 35.9 8.0 35.4 9.5 12.8
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 15.7 6.5 13.0 39.9
Single modes 16.3 1.3 6.5 1.2 11.8 2.0 42.3
Truck 23.9 7.0 19.4 7.6 23.4 7.3 43.5
Rail 14.7 4.3 15.6 4.8 13.0 5.5 9.0
All other Single modes 34.4 2.9 44.5 5.0 49.0 5.5 31.4
Multiple modes 31.6 0.8 33.1 0.8 31.6 1.8 17.1
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes 31.7 0.8 33.1 0.8 31.6 1.8 16.8
Other and unknown modes 37.2 0.5 33.3 0.4 35.2 0.2 24.4

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 39.1 25.3 46.5 44.0
Single modes 40.2 4.2 26.5 5.7 46.6 1.7 39.3
Truck 45.4 7.2 21.4 8.5 30.9 11.3 42.5
Rail 29.5 3.5 38.2 1.9 32.6 9.6 9.4
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 49.3
Parcel, USPS or courier S S S S S S S
All other multiple modes S S S S S S 30.4
Other and unknown modes S S S S S S 32.6

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 38.2 26.3 24.6 S
Single modes 38.1 0.1 25.1 0.9 24.6 1.9 S
Truck S S S S 43.3 2.7 S
Rail 20.9 11.3 26.1 12.6 37.6 10.2 30.7
All other Single modes 42.1 11.0 40.9 8.3 41.1 8.9 38.4
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 21.3 27.2 14.0 24.9
Single modes 22.2 1.8 27.2 1.5 14.7 2.7 S
Truck 22.3 1.8 32.0 6.8 18.1 7.5 S
Rail 44.3 0.5 35.9 4.0 38.8 5.6 20.8
All other Single modes S S S S S S 22.4
Multiple modes 45.6 1.7 35.5 0.8 42.2 2.2 22.6
Parcel, USPS or courier S S S S S S 13.2
All other multiple modes 39.2 0.3 S S 48.7 2.3 24.3
Other and unknown modes S S S S S S 39.8

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 24.3 28.4 33.1 7.9
Single modes 25.6 3.9 28.3 0.6 32.8 1.3 16.2
Truck 25.8 4.0 28.3 0.6 32.7 1.4 16.4
Rail 49.5 0.2 S S S S 26.0
All other Single modes S S 48.2 48.0 15.4
Multiple modes 27.7 3.9 35.2 0.5 36.7 1.2 6.6
Parcel, USPS or courier 27.9 3.9 39.8 0.5 42.4 0.9 6.6
All other multiple modes S S S S S S 29.8
Other and unknown modes 49.6 0.2 48.2 0.3 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 22.6 37.1 26.9 29.0
Single modes 23.8 3.4 37.3 0.5 27.3 1.1 36.7
Truck 24.6 4.0 39.1 5.2 30.2 5.9 42.0
Rail S S 49.9 2.4 S S 24.2
All other Single modes S S S S S S 25.0
Multiple modes 29.0 1.5 31.4 0.4 28.9 0.8 20.2
Parcel, USPS or courier 35.6 1.5 40.7 20.8 0.1 20.6
All other multiple modes 35.8 0.3 35.9 0.3 30.7 0.8 23.1
Other and unknown modes S S 40.7 0.3 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 11.0 11.8 9.0 6.8
Single modes 18.1 8.5 13.0 5.5 10.4 3.6 13.7
Truck 17.6 8.0 12.9 5.1 10.8 4.4 18.0
Rail S S S S S S 26.3
All other Single modes 46.5 0.4 49.9 0.2 44.5 0.5 10.5
Multiple modes 17.6 5.4 30.6 1.8 33.7 3.8 7.5
Parcel, USPS or courier 20.2 5.7 38.2 1.5 44.1 3.9 7.5
All other multiple modes S S S S S S 27.7
Other and unknown modes 39.5 7.9 40.1 6.4 S S 37.1

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 14.3 28.7 23.0 9.3
Single modes 14.5 1.5 29.7 1.7 23.8 1.2 20.9
Truck 14.8 1.6 30.1 5.4 20.2 9.6 21.9
Rail 39.6 0.4 S S S S 25.3
All other Single modes S S S S S S 21.9
Multiple modes 21.5 1.5 24.7 0.4 23.2 1.0 3.8
Parcel, USPS or courier 21.5 1.5 24.7 0.4 23.2 1.0 3.8
All other multiple modes
Other and unknown modes 48.8 0.5 S S 41.1 0.7 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 40.5 S S S S S
Single modes 43.9 12.0 S S S S 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 28.8
Multiple modes S S S S S S 32.2
Parcel, USPS or courier 45.4 10.9 49.1 10.5 S S 26.7
All other multiple modes S S S S S S 31.6
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.