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 10.8 14.9 16.7 24.6
Single modes 11.6 2.7 15.0 16.6 0.3 29.8
Truck 12.3 3.2 15.3 2.3 15.9 3.3 18.8
Rail S S S S S S S
All other Single modes 26.4 1.2 29.1 35.9 0.2 5.2
Multiple modes 20.3 2.5 25.0 42.9 0.3 13.5
Parcel, USPS or courier 20.5 2.6 26.9 42.9 0.2 13.6
All other multiple modes S S S S S S S
Other and unknown modes 24.6 0.4 26.6 49.5 0.2 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 S S S S S S 27.7
Single modes S S S S S S 35.6
Truck S S S S S S 35.6
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 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 32.7 38.0 46.5 36.0
Single modes 32.7 0.1 38.1 46.5 30.6
Truck 32.7 0.1 38.1 46.5 30.6
Rail
All other Single modes
Multiple modes S S S S S S 31.8
Parcel, USPS or courier S S S S S S 31.8
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 15.3 21.4 31.0 31.8
Single modes 15.5 1.5 21.5 31.0 0.1 31.8
Truck 16.3 5.3 22.1 3.9 18.7 11.2 19.3
Rail S S S S S S 30.1
All other Single modes
Multiple modes
Parcel, USPS or courier
All other multiple modes
Other and unknown modes S S S S S S 29.8

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 17.6 19.5 22.1 11.8
Single modes 17.7 0.1 19.5 0.2 22.1 0.2 12.0
Truck 17.7 0.1 19.5 0.2 22.1 0.2 12.0
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 33.9

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 30.2 41.2 39.9 S
Single modes 30.0 2.4 41.2 4.5 40.1 1.4 S
Truck 30.2 10.2 39.6 10.1 37.4 10.0 S
Rail S S S S S S 31.6
All other Single modes S S S S S S 26.0
Multiple modes S S S S S S 20.6
Parcel, USPS or courier S S S S S S 20.6
All other multiple modes
Other and unknown modes S S S S S S 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 14.5 19.0 32.2 21.8
Single modes 13.4 6.3 20.4 3.7 34.6 6.7 35.1
Truck 13.5 6.5 20.5 3.8 36.2 7.2 32.4
Rail S S S S S S 31.6
All other Single modes 48.5 0.5 S S S S 21.0
Multiple modes 31.0 4.9 23.4 1.1 47.0 3.3 16.8
Parcel, USPS or courier 31.3 4.9 25.3 1.0 46.5 3.0 16.8
All other multiple modes S S S S S S 35.8
Other and unknown modes 38.0 2.2 49.0 2.9 47.8 4.6 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 15.7 47.6 38.6 S
Single modes 15.3 4.6 48.5 1.8 39.2 1.2 S
Truck 15.8 4.8 48.6 1.9 39.4 1.5 S
Rail
All other Single modes S S S S S S 30.7
Multiple modes 48.2 4.3 S S 24.7 0.8 15.1
Parcel, USPS or courier S S 46.8 0.4 25.5 0.8 15.8
All other multiple modes S S S S S S 31.6
Other and unknown modes S S 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 35.5 26.0 42.3 S
Single modes 41.9 10.0 26.9 3.6 41.9 7.5 S
Truck 48.7 10.1 27.0 9.0 42.4 11.3 S
Rail
All other Single modes 28.7 6.3 45.2 6.2 42.1 7.9 25.2
Multiple modes 25.6 9.8 44.5 2.5 S S 19.3
Parcel, USPS or courier 25.6 9.8 44.5 2.5 S S 19.3
All other multiple modes
Other and unknown modes S S S S 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 10.3 14.6 38.0 21.7
Single modes 12.1 6.6 14.8 0.6 39.0 3.3 19.4
Truck 12.2 6.5 14.8 1.0 38.3 3.2 21.4
Rail S S S S S S 30.0
All other Single modes 49.2 0.3 S S S S 26.4
Multiple modes 33.1 6.6 35.8 0.5 27.8 3.3 14.4
Parcel, USPS or courier 33.1 6.6 35.8 0.5 27.8 3.3 14.4
All other multiple modes
Other and unknown modes S S S S S S 29.6

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 42.1 S S 37.4 S
Single modes 44.1 14.5 S S 37.5 14.9 S
Truck 44.1 14.5 S S 37.5 14.9 S
Rail
All other Single modes
Multiple modes S S S S S S 43.2
Parcel, USPS or courier S S S S S S 43.2
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.