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 7.0 41.5 17.5 13.9
Single modes 8.4 2.5 42.7 1.4 19.2 2.5 36.8
Truck 9.3 3.1 S S 15.1 5.7 43.7
Rail 23.1 0.2 23.7 0.8 25.3 2.2 23.9
All other Single modes 27.5 1.9 29.1 6.6 28.5 9.2 4.3
Multiple modes 12.2 2.2 18.0 0.3 23.3 1.7 5.8
Parcel, USPS or courier 12.4 2.2 19.9 0.2 14.4 0.3 5.8
All other multiple modes S S 33.3 0.1 36.6 1.4 33.7
Other and unknown modes 24.5 0.8 29.9 1.2 41.5 2.1 29.2

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 35.9 29.0 30.6 S
Single modes 36.9 1.9 29.5 2.1 30.7 4.0 S
Truck 46.9 10.5 48.1 9.7 41.5 7.6 S
Rail 30.0 3.8 37.9 3.9 41.1 5.1 18.0
All other Single modes 31.8 10.4 32.0 13.8 32.2 14.6 15.0
Multiple modes S S S S S S 26.1
Parcel, USPS or courier S S S S S S 28.9
All other multiple modes S S S S S S 28.4
Other and unknown modes S S 49.7 1.6 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 32.6 33.6 36.0 S
Single modes 32.9 0.4 33.9 0.9 36.4 2.4 S
Truck 33.4 5.6 35.1 11.2 41.3 11.7 S
Rail S S 44.2 9.4 45.2 10.2 21.1
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 39.4
Parcel, USPS or courier S S S S S S 39.4
All other multiple modes
Other and unknown modes 35.7 0.4 42.1 0.9 S S 30.9

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 45.8 12.6 35.0 33.3
Single modes 45.0 2.0 12.6 0.9 22.1 7.7 14.1
Truck 48.8 11.6 22.3 11.1 28.6 10.7 15.4
Rail
All other Single modes 45.9 11.7 45.8 11.4 49.7 12.0 S
Multiple modes S S S S S S 30.3
Parcel, USPS or courier S S S S S S 30.3
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 32.3

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 47.7 42.9 40.1 S
Single modes 48.3 4.6 46.3 4.9 41.5 6.9 S
Truck 48.3 9.7 43.6 11.9 38.1 18.8 S
Rail S S S S S S 27.9
All other Single modes S S S S 41.9 13.7 32.7
Multiple modes S S S S S S S
Parcel, USPS or courier S S S S S S S
All other multiple modes S S S S S S 26.1
Other and unknown modes S S S S S S 30.4

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 18.8 24.6 30.3 23.5
Single modes 30.1 10.8 24.5 1.7 31.0 3.3 37.1
Truck 30.1 10.8 24.5 1.8 31.1 3.8 36.6
Rail
All other Single modes 40.9 S S 43.2 0.6 8.0
Multiple modes 33.6 11.0 29.8 1.5 42.6 2.4 15.3
Parcel, USPS or courier 33.6 11.0 29.8 1.5 42.6 2.4 15.3
All other multiple modes
Other and unknown modes 34.9 0.5 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 12.0 10.0 12.1 10.9
Single modes 13.2 4.0 10.0 4.9 14.0 4.8 27.5
Truck 13.6 4.2 10.0 5.0 12.6 6.8 25.9
Rail 40.2 0.8 37.4 2.3 45.0 5.0 24.6
All other Single modes S S S S S S 13.3
Multiple modes 14.9 2.3 39.8 0.9 26.4 1.1 7.0
Parcel, USPS or courier 14.8 2.3 40.7 0.9 23.5 1.0 7.0
All other multiple modes S S S S S S 28.2
Other and unknown modes S S S S S S 27.5

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 18.3 S S 45.0 35.5
Single modes 22.7 4.3 S S 47.3 3.2 S
Truck 23.3 5.1 S S S S S
Rail 37.1 0.6 43.7 0.7 47.0 2.8 19.8
All other Single modes 36.6 1.0 S S S S 22.7
Multiple modes 19.7 3.6 32.6 0.7 S S 19.0
Parcel, USPS or courier 19.7 3.6 23.7 0.7 17.6 1.0 19.0
All other multiple modes S S S S S S 31.6
Other and unknown modes 44.9 1.9 42.4 1.0 36.6 0.4 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 13.5 18.4 13.7 6.3
Single modes 16.4 6.2 14.0 7.4 22.3 6.5 15.0
Truck 11.9 5.0 15.1 6.9 25.1 7.2 25.2
Rail S S S S S S 31.6
All other Single modes 30.6 5.5 24.5 1.2 24.6 2.4 1.5
Multiple modes 21.0 5.3 31.8 5.9 25.1 7.1 5.2
Parcel, USPS or courier 21.3 5.4 30.4 5.5 23.5 6.4 5.2
All other multiple modes S S S S S S S
Other and unknown modes S S S S S S 43.1

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 10.5 21.6 18.7 10.9
Single modes 11.5 3.7 22.2 1.1 21.2 4.0 20.9
Truck 11.5 3.7 23.4 2.7 21.4 5.5 24.4
Rail 42.2 42.1 2.2 42.2 5.9 S
All other Single modes 17.8 0.2 26.7 22.1 0.3 9.8
Multiple modes 17.6 3.8 22.0 0.7 35.8 4.0 9.9
Parcel, USPS or courier 18.9 4.0 23.9 0.7 19.2 3.0 9.9
All other multiple modes S S S S S S 30.3
Other and unknown modes 42.5 1.5 48.7 0.5 S S 48.6

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 31.6 S S S S 26.0
Single modes 31.1 8.3 S S S S 26.4
Truck 31.9 8.1 S S S S 27.0
Rail
All other Single modes S S S S S S 31.6
Multiple modes 45.0 8.4 S S S S 26.5
Parcel, USPS or courier 44.4 8.5 S S S S 26.5
All other multiple modes S S S S S S 31.6
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.