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 27.8 34.4 16.7 9.7
Single modes 30.4 2.0 35.3 0.8 17.1 1.6 15.8
Truck 31.0 2.1 37.5 2.8 20.3 5.4 16.2
Rail 41.4 0.9 36.5 2.5 42.2 5.4 8.3
All other Single modes 30.3 0.1 S S S S 19.5
Multiple modes 21.1 1.8 40.2 0.5 38.3 1.5 8.4
Parcel, USPS or courier 22.1 1.8 21.4 30.0 0.4 8.5
All other multiple modes 36.9 S S 47.5 1.1 S
Other and unknown modes 33.8 0.9 35.6 0.6 36.8 1.2 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 48.0 35.5 S S 21.3
Single modes 48.0 35.5 S S 21.4
Truck 48.0 35.5 S S 21.4
Rail
All other Single modes S S S S S S 29.8
Multiple modes
Parcel, USPS or courier
All other multiple modes
Other and unknown modes S S S S S S 29.8

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 14.4 13.5 23.6 19.4
Single modes 14.7 1.0 13.7 0.4 24.7 3.6 19.7
Truck 14.7 1.0 13.7 0.4 24.8 3.6 19.7
Rail
All other Single modes S S S S S S 31.3
Multiple modes S S S S S S 27.9
Parcel, USPS or courier
All other multiple modes S S S S S S 27.9
Other and unknown modes

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 S S S S S
Single modes S S S S S S S
Truck S S S S S S S
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 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 33.4 37.0 43.3 S
Single modes 33.4 0.7 36.9 43.3 S
Truck 33.4 0.7 36.9 43.3 S
Rail
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 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 34.3 29.2 27.6 16.3
Single modes 23.6 12.6 30.4 5.3 29.0 9.2 31.1
Truck 23.5 12.6 30.3 4.9 29.1 8.9 31.2
Rail 43.6 0.2 44.3 1.1 47.6 2.2 27.2
All other Single modes S S S S S S 27.8
Multiple modes S S S S 43.3 7.7 13.7
Parcel, USPS or courier S S S S 42.7 7.7 13.7
All other multiple modes S S S S S S 29.9
Other and unknown modes 41.7 1.4 36.9 3.8 43.2 3.9 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 15.8 22.1 33.2 16.5
Single modes 16.6 4.6 23.1 1.7 39.3 5.1 28.9
Truck 10.5 5.0 17.9 5.0 18.2 8.0 29.8
Rail S S S S S S 12.5
All other Single modes S S S S S S 28.1
Multiple modes 32.7 3.8 S S S S 11.5
Parcel, USPS or courier 33.3 3.8 S S S S 11.5
All other multiple modes S S S S S S 31.1
Other and unknown modes 31.4 1.9 33.6 1.7 45.8 5.4 32.7

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 20.3 38.1 12.2 18.9
Single modes 18.4 2.8 39.3 2.0 12.6 2.8 36.5
Truck 19.0 3.8 41.2 3.7 15.1 5.2 36.6
Rail 40.6 1.5 38.7 3.7 40.5 5.9 24.7
All other Single modes S S S S S S 26.3
Multiple modes S S S S S S 14.8
Parcel, USPS or courier S S 40.7 46.1 0.1 14.9
All other multiple modes 47.8 0.4 S S S S 25.8
Other and unknown modes 36.3 2.4 48.8 0.9 42.9 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 S S S S 47.5 15.4
Single modes S S S S 49.0 3.9 20.1
Truck S S S S 49.0 3.9 18.8
Rail
All other Single modes 47.5 0.5 36.0 39.9 18.7
Multiple modes S S 33.9 1.7 27.7 3.0 13.5
Parcel, USPS or courier S S 33.9 1.7 27.7 3.0 13.5
All other multiple modes
Other and unknown modes 40.0 0.7 47.3 1.3 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 33.9 38.4 43.4 16.9
Single modes 31.8 2.3 35.7 2.0 42.5 1.3 14.2
Truck 31.8 2.3 35.8 4.8 47.0 9.9 14.9
Rail 43.8 0.2 41.7 3.7 43.8 9.4 26.3
All other Single modes S S 39.7 S S 29.0
Multiple modes S S 44.7 0.1 45.1 0.8 10.9
Parcel, USPS or courier S S 46.7 S S 11.0
All other multiple modes S S S S S S 28.1
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 49.2 43.4 S S 22.8
Single modes S S S S S S 30.7
Truck S S S S S S 30.7
Rail
All other Single modes
Multiple modes S S 46.4 18.3 45.7 18.3 25.4
Parcel, USPS or courier S S 46.4 18.3 45.7 18.3 25.4
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.