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 6.2 18.0 18.3 8.4
Single modes 7.2 1.9 18.3 1.1 18.6 0.4 13.8
Truck 7.7 2.4 15.4 4.6 13.8 4.1 13.3
Rail 23.0 0.4 S S 38.4 3.9 37.4
All other Single modes 37.4 0.5 S S S S S
Multiple modes 14.8 0.8 29.5 25.4 0.4 9.5
Parcel, USPS or courier 16.8 0.9 24.9 32.9 0.3 9.5
All other multiple modes 49.6 0.1 40.9 36.1 0.2 25.7
Other and unknown modes 41.6 1.6 S S 19.5 0.2 48.4

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 19.4 35.4 30.8 31.6
Single modes 19.7 1.0 35.8 2.0 31.3 2.0 32.6
Truck 19.7 1.0 35.8 2.0 31.3 2.0 32.6
Rail
All other Single modes
Multiple modes S S S S S S 29.8
Parcel, USPS or courier S S S S S S 29.8
All other multiple modes
Other and unknown modes 48.9 1.0 45.1 2.0 45.3 2.0 33.3

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 25.5 43.8 29.1 S
Single modes 26.9 5.6 47.3 5.6 28.8 1.3 S
Truck 26.9 5.6 47.3 5.6 28.8 1.3 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 49.0

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 24.5 25.5 30.7 37.5
Single modes 25.7 2.6 26.5 2.7 31.2 1.1 41.5
Truck 28.7 5.3 28.0 4.2 34.3 7.7 44.1
Rail 17.5 4.5 21.9 3.6 30.7 7.5 39.5
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 29.8
Parcel, USPS or courier S S S S S S 31.6
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 46.7

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 39.3 47.1 46.9 S
Single modes 39.5 0.3 47.4 0.4 45.3 2.4 S
Truck 41.1 3.3 48.9 2.7 45.9 2.9 S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S S S 29.1
Parcel, USPS or courier S S S S S S 29.8
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 30.0

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 13.3 39.4 25.3 23.6
Single modes 13.7 1.7 39.7 0.9 26.3 2.1 39.2
Truck 16.4 4.3 42.8 10.7 24.2 9.9 38.3
Rail 31.4 1.9 36.9 5.3 48.3 9.3 31.1
All other Single modes S S S S S S 27.6
Multiple modes 43.6 1.7 27.3 0.8 32.0 1.6 16.0
Parcel, USPS or courier S S 41.1 0.2 S S 16.0
All other multiple modes S S S S 49.1 1.6 28.2
Other and unknown modes 36.4 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 6.6 47.4 33.5 10.5
Single modes 7.8 2.3 47.9 0.7 34.3 0.8 10.5
Truck 7.3 2.1 28.1 13.2 14.0 8.7 10.8
Rail 45.3 1.4 S S S S S
All other Single modes 44.8 S S S S 20.4
Multiple modes 18.2 1.9 35.5 0.2 46.7 0.6 8.9
Parcel, USPS or courier 18.3 1.9 39.3 0.2 49.9 0.6 8.9
All other multiple modes S S S S S S 31.6
Other and unknown modes 34.2 0.6 41.1 0.6 43.2 0.6 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 24.3 S S 37.5 28.1
Single modes 28.7 5.5 S S 38.0 2.7 46.4
Truck 28.8 5.4 S S 40.3 6.4 46.1
Rail S S S S S S 30.0
All other Single modes 42.6 S S 47.1 11.1
Multiple modes 38.8 4.7 40.2 2.1 42.0 2.5 S
Parcel, USPS or courier 40.8 4.7 48.3 1.3 S S 15.7
All other multiple modes 41.6 0.4 46.3 0.9 S S 27.2
Other and unknown modes 40.5 1.5 S S 43.6 1.5 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 15.3 25.0 35.3 18.7
Single modes 12.1 5.6 26.0 4.4 36.8 1.7 S
Truck 12.3 5.6 26.1 4.4 37.1 2.0 S
Rail S S S S S S 31.6
All other Single modes 38.3 0.5 32.8 0.1 43.0 0.4 6.6
Multiple modes 27.1 2.3 27.5 1.2 27.5 1.0 6.1
Parcel, USPS or courier 27.1 2.3 27.6 1.2 27.7 1.0 6.1
All other multiple modes S S S S S S 31.6
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 19.2 35.3 19.7 15.3
Single modes 19.6 0.6 35.4 0.2 20.0 0.6 13.3
Truck 19.9 1.2 37.4 4.8 20.0 0.6 13.3
Rail S S S S S S 31.6
All other Single modes S S S S S S 21.4
Multiple modes 26.1 0.7 25.9 0.1 21.1 0.2 18.2
Parcel, USPS or courier 26.2 0.7 26.2 0.1 23.6 0.2 18.2
All other multiple modes S S S S S S 31.6
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 30.0 S S 32.3 S
Single modes 32.5 13.9 S S 33.0 13.8 S
Truck 32.5 13.9 S S 33.0 13.8 S
Rail
All other Single modes S S S S S S 31.6
Multiple modes S S S S 44.8 15.0 S
Parcel, USPS or courier S S S S 44.8 15.0 S
All other multiple modes
Other and unknown modes S S S S S S 32.4

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.