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 8.3 17.7 17.4 11.2
Single modes 7.9 3.4 18.4 0.9 18.5 1.7 20.8
Truck 7.6 4.0 13.1 4.2 15.8 5.4 23.8
Rail 47.1 0.6 S S 49.0 6.0 27.6
All other Single modes 33.0 0.9 37.4 28.1 0.1 5.8
Multiple modes 20.2 2.9 20.2 0.3 23.7 1.2 9.8
Parcel, USPS or courier 20.6 2.9 19.6 0.2 20.0 0.6 10.0
All other multiple modes 27.9 0.1 32.6 0.1 33.7 0.7 18.0
Other and unknown modes 49.1 2.7 30.5 0.8 35.3 1.2 26.8

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 36.7 S S S S S
Single modes 37.8 9.8 S S S S S
Truck 38.9 9.6 S S 32.4 16.9 S
Rail S S S S S S S
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 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 17.1 23.5 21.2 18.5
Single modes 18.6 3.5 24.2 1.6 22.7 3.1 17.7
Truck 18.7 3.7 24.3 1.8 23.0 3.4 17.2
Rail S S S S S S 28.4
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S 43.2
All other multiple modes S S S S S S 29.2
Other and unknown modes S S S S S S 33.1

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 25.7 20.2 39.1 31.9
Single modes 21.8 3.2 20.2 39.1 19.6
Truck 22.7 4.1 18.9 4.7 24.9 12.7 18.9
Rail S S S S S S 26.9
All other Single modes
Multiple modes S S S S S S 29.8
Parcel, USPS or courier S S S S S S 29.8
All other multiple modes
Other and unknown modes S S S S S S 31.6

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 37.4 S S S S 27.3
Single modes 35.9 9.5 S S S S 28.3
Truck 37.6 9.7 29.3 15.6 S S 28.5
Rail S S S S S S 28.2
All other Single modes 48.0 0.6 44.4 0.3 44.2 1.5 27.3
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 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 28.9 11.0 18.7 15.3
Single modes 20.4 6.4 11.5 1.9 19.2 1.7 27.7
Truck 20.7 6.4 11.5 1.8 19.3 1.7 26.1
Rail S S S S S S 33.3
All other Single modes S S S S S S 15.9
Multiple modes 49.2 6.8 35.8 1.2 35.7 1.8 13.8
Parcel, USPS or courier 49.2 6.8 36.5 1.2 38.9 1.4 13.8
All other multiple modes S S S S S S 28.6
Other and unknown modes 38.9 1.3 S S 44.1 1.0 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 17.0 32.7 24.8 14.9
Single modes 20.3 5.0 32.5 0.7 25.5 1.7 20.8
Truck 20.4 5.1 32.6 0.9 25.9 2.5 22.2
Rail S S S S S S 28.0
All other Single modes 45.3 S S S S 18.9
Multiple modes 21.8 4.9 33.5 0.5 35.7 1.3 19.2
Parcel, USPS or courier 22.3 5.0 38.2 0.5 36.5 1.1 12.1
All other multiple modes S S S S S S 27.9
Other and unknown modes 39.1 2.5 44.7 0.5 22.4 1.0 44.2

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 19.3 23.0 31.7 27.0
Single modes 20.4 3.8 23.3 0.5 32.2 1.5 S
Truck 21.0 3.7 24.7 3.6 36.4 6.9 S
Rail S S 32.6 3.5 43.0 6.4 20.8
All other Single modes 42.6 0.7 S S S S 15.1
Multiple modes 31.9 3.7 34.8 0.3 39.2 1.4 12.4
Parcel, USPS or courier 33.1 3.7 33.4 45.2 0.3 12.4
All other multiple modes 33.5 0.2 44.0 0.4 46.6 1.5 S
Other and unknown modes 33.9 2.0 S S 31.3 0.5 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 18.3 27.8 26.2 16.6
Single modes 17.0 6.5 33.5 9.6 31.5 6.9 43.9
Truck 14.7 6.7 33.7 9.8 35.5 8.8 S
Rail S S S S S S 28.0
All other Single modes 39.0 3.4 41.7 0.3 37.4 4.3 5.3
Multiple modes 31.7 5.6 S S S S 7.8
Parcel, USPS or courier 31.8 5.6 S S S S 7.7
All other multiple modes S S S S S S 27.9
Other and unknown modes S S S S S S 36.7

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 12.8 26.0 17.0 11.8
Single modes 12.6 7.2 26.6 1.0 17.5 1.7 21.1
Truck 12.6 7.1 22.9 2.8 15.3 2.9 22.1
Rail S S S S S S S
All other Single modes 45.5 0.5 S S S S 14.6
Multiple modes 47.0 7.5 23.7 0.9 24.3 1.3 23.7
Parcel, USPS or courier 49.5 7.6 25.3 0.9 29.9 1.4 20.2
All other multiple modes 41.3 0.6 S S S S 26.9
Other and unknown modes S S 35.3 0.4 S S 36.1

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 39.8 46.9 S S S
Single modes 41.4 5.6 46.9 3.3 S S S
Truck 32.0 8.1 47.2 4.0 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 S
Parcel, USPS or courier S S S S S S S
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.