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 3.2 18.9 4.6 9.4
Single modes 3.3 0.9 18.3 1.8 5.0 0.5 18.1
Truck 3.8 1.5 18.4 1.9 5.2 1.4 19.3
Rail 44.2 0.2 38.0 0.4 44.1 1.4 32.7
All other Single modes 38.9 0.8 36.1 36.4 0.1 12.2
Multiple modes 14.4 0.9 20.0 19.2 0.3 6.8
Parcel, USPS or courier 14.1 0.8 19.6 13.1 0.1 6.8
All other multiple modes S S 38.4 35.9 0.2 16.7
Other and unknown modes 17.8 0.3 S S 26.7 0.4 21.1

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 36.1 26.6 19.6 39.7
Single modes 31.1 8.9 28.2 8.7 21.0 9.1 44.7
Truck 31.7 9.2 29.2 8.9 21.0 9.2 44.9
Rail S S S S S S 31.6
All other Single modes
Multiple modes
Parcel, USPS or courier
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 25.6 21.9 25.3 S
Single modes 25.6 0.1 22.3 2.1 25.6 0.7 S
Truck 25.8 0.6 22.1 3.2 26.0 6.4 S
Rail 39.6 0.6 40.0 3.1 47.1 6.5 24.3
All other Single modes
Multiple modes S S S S S S 19.7
Parcel, USPS or courier S S S S S S 19.7
All other multiple modes
Other and unknown modes S S S S S S 25.3

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 15.2 24.3 25.3
Single modes S S 15.1 24.3 25.3
Truck S S 15.1 24.3 25.3
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 32.2

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 36.7 36.7 39.8 S
Single modes 36.7 36.7 39.8 S
Truck 36.7 36.7 39.8 S
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
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 24.3 24.1 22.1 26.2
Single modes 26.0 3.3 24.5 1.6 22.4 0.7 34.1
Truck 26.1 3.4 24.5 1.7 22.4 0.9 35.3
Rail S S S S S S 31.6
All other Single modes S S S S S S 26.0
Multiple modes 32.0 3.2 S S 41.0 0.7 36.2
Parcel, USPS or courier 32.0 3.2 S S 41.0 0.7 36.2
All other multiple modes
Other and unknown modes S S 39.1 S S 38.1

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 10.6 21.4 10.5 8.8
Single modes 11.5 1.6 21.7 0.4 10.4 0.6 13.2
Truck 11.2 1.6 21.7 0.5 10.7 1.5 13.3
Rail S S S S S S 32.2
All other Single modes S S 49.8 0.1 S S 26.1
Multiple modes 25.2 1.7 22.0 0.2 24.4 0.5 12.8
Parcel, USPS or courier 25.0 1.5 24.0 0.1 23.1 0.3 12.9
All other multiple modes S S 48.5 45.4 0.4 23.2
Other and unknown modes 30.3 0.7 32.2 0.3 46.9 0.1 33.3

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 11.6 S S 16.3 16.8
Single modes 11.6 3.2 S S 16.7 1.3 27.5
Truck 11.6 3.3 S S 16.7 1.7 28.4
Rail S S S S S S S
All other Single modes S S S S S S 23.8
Multiple modes 28.1 3.6 S S 35.4 0.7 9.3
Parcel, USPS or courier 28.1 3.6 S S 34.6 0.6 9.3
All other multiple modes S S S S S S 31.6
Other and unknown modes 43.7 2.0 S S 45.8 1.3 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 19.3 40.1 22.3 20.6
Single modes 23.0 4.6 41.4 2.1 22.8 2.1 22.1
Truck 27.5 7.3 41.7 2.2 23.0 2.2 26.0
Rail
All other Single modes 39.4 4.4 S S S S 18.9
Multiple modes 32.1 4.4 30.1 0.7 34.9 1.6 13.4
Parcel, USPS or courier 32.1 4.4 30.1 0.7 34.9 1.6 13.4
All other multiple modes
Other and unknown modes 41.5 1.4 48.1 1.9 34.2 2.0 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 16.9 16.0 12.5 18.9
Single modes 18.9 4.3 16.1 0.8 14.4 3.4 33.4
Truck 19.0 4.6 16.1 0.8 14.4 3.5 34.2
Rail S S S S S S 29.8
All other Single modes S S 39.3 35.7 17.1
Multiple modes 46.4 4.4 46.3 0.7 S S 11.6
Parcel, USPS or courier 48.0 4.0 S S S S 12.2
All other multiple modes S S S S S S 29.1
Other and unknown modes 43.9 0.8 S S S S 49.9

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 49.2 35.4 S S S
Single modes S S 35.2 15.4 S S S
Truck S S 35.2 15.5 S S S
Rail
All other Single modes S S S S S S 31.6
Multiple modes 43.2 17.4 S S 49.2 15.0 S
Parcel, USPS or courier 43.2 17.4 S S 49.2 15.0 S
All other multiple modes
Other and unknown modes

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.