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 10.7 15.6 25.6 36.1
Single modes 13.0 3.1 15.7 0.3 25.7 1.6 S
Truck 15.7 4.7 18.8 7.2 31.8 8.0 S
Rail 40.8 1.4 S S 47.6 7.4 S
All other Single modes 20.4 2.2 S S S S 5.8
Multiple modes 17.7 2.5 39.3 0.2 41.8 0.9 15.7
Parcel, USPS or courier 17.9 2.5 39.3 0.2 41.8 0.9 16.0
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 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 S S S S S S 45.1
Single modes S S S S S S 32.2
Truck S S S S S S 30.7
Rail S S S S S S 31.6
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 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 46.2 45.6 S S 41.2
Single modes 47.8 3.1 45.8 0.5 S S S
Truck 47.8 3.1 45.8 0.5 S S S
Rail
All other Single modes
Multiple modes S S S S S S 37.3
Parcel, USPS or courier S S S S S S 37.3
All other multiple modes
Other and unknown modes S S S S S S 31.6

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 35.8 34.4 36.9 S
Single modes 35.8 34.4 36.9 S
Truck 44.4 10.2 37.7 10.5 35.8 10.5 S
Rail 39.2 12.9 40.2 13.1 48.6 12.1 S
All other Single modes S S S S S S 31.6
Multiple modes
Parcel, USPS or courier
All other multiple modes
Other and unknown modes

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 29.9 37.5 S S S
Single modes 29.9 37.5 S S S
Truck 29.9 37.5 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 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 26.5 S S 26.3 S
Single modes 30.5 10.0 S S 31.7 12.0 S
Truck 33.9 11.5 S S 37.8 13.8 S
Rail S S S S S S 31.6
All other Single modes S S 47.8 1.0 42.4 5.7 21.7
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 31.2

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 23.4 36.7 22.3 36.1
Single modes 24.0 10.3 38.3 10.0 21.5 10.2 S
Truck 24.0 10.3 38.4 10.0 21.4 10.2 S
Rail
All other Single modes S S S S S S 24.2
Multiple modes S S S S S S 36.6
Parcel, USPS or courier S S S S S S 36.6
All other multiple modes
Other and unknown modes S S S S 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 20.3 34.6 49.5 27.5
Single modes 22.2 2.9 35.2 5.2 S S S
Truck 23.5 3.9 35.3 5.4 S S S
Rail S S S S S S S
All other Single modes 32.7 2.4 44.1 45.1 2.7 14.5
Multiple modes 27.5 2.0 S S S S 15.5
Parcel, USPS or courier 27.5 2.0 S S S S 15.5
All other multiple modes
Other and unknown modes 40.7 1.1 S S 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 24.2 30.4 39.7 39.9
Single modes 25.3 7.3 31.7 7.2 39.7 5.4 S
Truck 28.6 5.6 33.4 9.6 45.4 10.5 S
Rail
All other Single modes 27.2 9.2 42.3 9.6 38.8 9.3 4.3
Multiple modes 27.8 6.5 S S S S 17.7
Parcel, USPS or courier 27.8 6.5 S S S S 17.7
All other multiple modes
Other and unknown modes S S S S S S 41.1

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 45.0 48.3 39.7 S
Single modes 45.9 6.1 49.9 4.9 40.5 4.9 S
Truck 45.7 5.9 S S 40.7 5.1 S
Rail
All other Single modes S S S S S S 36.4
Multiple modes 48.8 6.1 S S 48.2 4.9 20.8
Parcel, USPS or courier S S S S 48.2 4.9 20.5
All other multiple modes S S S S S S 31.6
Other and unknown modes 46.6 0.1 S S S S 48.8

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 32.1 S S S S 27.6
Single modes S S S S S S S
Truck S S S S S S S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 28.3
Parcel, USPS or courier S S S S S S 28.3
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.