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 11.6 14.9 14.7 14.7
Single modes 12.2 1.4 15.0 0.2 14.6 0.6 18.3
Truck 11.9 1.6 15.0 1.7 15.4 4.4 14.2
Rail 21.6 0.9 21.5 1.8 20.8 4.7 14.5
All other Single modes 37.1 0.3 48.3 42.6 3.6
Multiple modes 20.1 0.8 39.7 45.0 0.4 8.6
Parcel, USPS or courier 21.6 0.8 20.3 18.2 8.5
All other multiple modes S S S S S S 45.2
Other and unknown modes 42.4 1.0 31.8 0.2 45.1 0.4 22.9

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 35.3 S S 43.0 21.9
Single modes 35.8 3.6 S S 43.0 0.6 S
Truck 35.5 4.4 S S 40.8 4.9 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 26.1
Parcel, USPS or courier S S S S S S 26.1
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 17.7 28.4 42.6 25.3
Single modes 17.9 0.5 28.5 0.3 42.7 0.2 17.7
Truck 19.1 4.7 32.7 8.3 34.5 13.9 13.8
Rail S S S S S S 31.6
All other Single modes
Multiple modes S S S S S S 30.1
Parcel, USPS or courier S S S S S S 30.1
All other multiple modes
Other and unknown modes 44.9 0.4 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 S S 29.5 29.8 26.4
Single modes S S 29.5 29.8 26.4
Truck S S 31.2 4.0 28.9 5.1 26.3
Rail 42.1 5.2 S S 45.0 5.1 34.2
All other Single modes
Multiple modes
Parcel, USPS or courier
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 38.3 48.6 45.2 S
Single modes 38.3 2.4 48.6 2.4 45.2 3.2 S
Truck 38.3 2.4 48.6 2.4 45.2 3.2 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 19.1 26.9 21.7 34.3
Single modes 19.3 1.1 27.1 0.4 22.4 2.2 S
Truck 21.1 3.7 36.7 7.5 23.0 5.7 S
Rail 14.1 3.8 14.8 7.3 29.5 6.2 26.7
All other Single modes S S 43.9 S S 25.4
Multiple modes 26.1 0.9 40.9 0.1 S S 12.8
Parcel, USPS or courier 27.9 0.8 25.8 31.9 12.8
All other multiple modes S S S S S S 30.5
Other and unknown modes 38.0 0.3 44.4 0.4 49.4 0.1 30.7

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 34.6 28.7 35.9 11.9
Single modes 37.2 4.0 29.4 2.1 36.0 1.1 14.3
Truck 36.8 3.9 29.4 4.1 37.5 5.0 11.5
Rail 45.7 1.3 34.5 3.5 36.6 5.2 7.4
All other Single modes S S S S S S 26.1
Multiple modes 43.4 2.2 47.9 0.3 37.1 0.4 13.9
Parcel, USPS or courier S S 30.6 0.1 27.9 0.1 13.8
All other multiple modes S S S S 47.8 0.4 S
Other and unknown modes S S 45.1 2.0 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 13.7 33.7 15.9 24.4
Single modes 14.3 3.1 33.9 0.4 15.8 0.2 35.2
Truck 14.4 3.6 36.5 4.9 14.8 6.0 35.3
Rail 25.4 2.3 26.1 4.7 24.6 5.9 16.2
All other Single modes S S S S S S 22.0
Multiple modes S S 33.0 34.7 13.9
Parcel, USPS or courier S S 32.9 34.6 13.9
All other multiple modes S S S S S S 31.6
Other and unknown modes 37.3 0.3 S S S S 28.2

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 19.5 18.4 22.8 23.5
Single modes 20.2 2.2 18.4 0.5 22.8 0.2 S
Truck 21.1 3.4 18.7 1.1 23.1 1.0 S
Rail
All other Single modes S S S S S S 13.3
Multiple modes 32.0 2.1 21.1 0.2 26.1 0.2 13.6
Parcel, USPS or courier 32.0 2.1 21.1 0.2 26.1 0.2 13.6
All other multiple modes
Other and unknown modes S S 45.6 0.4 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 35.6 39.6 28.5 44.9
Single modes 36.6 2.8 39.6 0.2 28.6 0.5 22.4
Truck 36.7 2.8 39.6 0.2 28.6 0.5 21.4
Rail
All other Single modes S S S S S S 23.9
Multiple modes 37.0 2.7 42.0 0.2 46.0 0.5 16.1
Parcel, USPS or courier 37.0 2.7 42.0 0.2 46.0 0.5 16.1
All other multiple modes
Other and unknown modes S S S S S S 41.8

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 S S 47.7 S S 25.0
Single modes 46.1 7.7 47.9 0.2 S S 27.8
Truck 46.1 7.7 47.9 0.2 S S 27.8
Rail
All other Single modes
Multiple modes S S S S S S 27.2
Parcel, USPS or courier S S S S S S 27.2
All other multiple modes
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.