Home » BTS Publications » Commodity Flow Survey » 2002 » Metropolitan Areas

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]

Excel | CSV

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 4.7 – 11.3 – 13.4 – 9.3
Single modes 5.0 2.1 11.6 0.6 12.1 1.8 19.0
Truck 5.6 2.7 13.6 3.7 13.5 2.5 24.5
Rail 33.2 0.2 33.9 0.9 24.0 2.7 13.7
All other Single modes 14.1 0.8 31.8 2.9 28.6 0.7 4.8
Multiple modes 12.1 1.7 33.1 0.4 45.8 1.8 5.6
Parcel, USPS or courier 12.6 1.8 12.7 0.1 14.9 0.4 5.6
All other multiple modes S S S S S S 2.4
Other and unknown modes 14.6 0.5 30.6 0.5 20.4 0.6 31.8

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 29.9 – 35.1 – S S S
Single modes 30.2 1.3 35.2 0.6 S S S
Truck 30.3 1.4 35.2 0.6 S S S
Rail S S S S S S 31.6
All other Single modes 41.0 0.2 S S S S 19.5
Multiple modes S S S S S S 18.4
Parcel, USPS or courier S S S S S S 28.9
All other multiple modes 41.6 0.3 S S S S 21.9
Other and unknown modes S S S S 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 17.0 – 19.1 – 31.8 – 23.8
Single modes 18.1 2.8 20.3 3.2 25.4 8.7 23.6
Truck 18.2 2.9 20.3 3.3 25.5 8.7 23.6
Rail S S S S S S 29.7
All other Single modes S S S S S S 29.8
Multiple modes S S S S S S 12.3
Parcel, USPS or courier S S S S S S 27.9
All other multiple modes S S S S S S 4.9
Other and unknown modes S S S S S S 41.8

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 19.2 – 23.0 – 43.3 – 30.6
Single modes 19.2 0.5 22.8 0.5 43.4 0.4 28.6
Truck 20.6 3.4 25.6 6.5 32.5 12.4 27.0
Rail S S S S S S 27.2
All other Single modes S S S S S S 29.8
Multiple modes 41.0 0.3 S S 49.0 – S
Parcel, USPS or courier 41.0 0.3 S S 49.0 – S
All other multiple modes – – – – – – –
Other and unknown modes S S S S S S 37.9

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 16.5 – 22.4 – 24.3 – 40.9
Single modes 16.5 0.1 21.8 0.6 24.2 0.3 35.2
Truck 11.4 7.1 14.7 7.4 23.4 2.8 35.9
Rail S S S S S S 31.5
All other Single modes 29.1 6.1 34.5 6.5 46.4 2.3 33.8
Multiple modes S S S S S S 28.8
Parcel, USPS or courier S S S S S S 30.5
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 37.7

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 9.1 – 18.4 – 17.7 – 15.8
Single modes 11.3 3.4 19.4 3.1 18.7 2.7 20.2
Truck 10.4 3.0 19.0 3.4 14.7 7.4 26.7
Rail 44.3 0.4 44.3 2.4 S S 21.1
All other Single modes S S S S S S 6.2
Multiple modes 13.8 3.5 11.4 0.7 17.2 1.4 13.8
Parcel, USPS or courier 13.7 3.4 8.7 0.7 18.3 1.5 13.8
All other multiple modes S S S S S S 10.6
Other and unknown modes 28.7 0.9 26.7 2.5 38.1 1.7 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 9.0 – 18.9 – 10.5 – 8.5
Single modes 13.3 4.4 20.8 2.4 14.5 4.0 17.5
Truck 13.1 4.3 19.6 2.2 10.2 3.5 19.4
Rail S S S S S S S
All other Single modes 34.3 0.1 40.9 – 35.4 0.2 8.1
Multiple modes 14.1 3.9 20.8 1.5 20.5 3.4 11.1
Parcel, USPS or courier 15.0 4.0 20.3 1.2 16.0 1.8 11.1
All other multiple modes 49.2 0.2 40.2 0.5 42.6 2.5 9.6
Other and unknown modes 32.0 2.2 28.0 1.4 26.3 1.2 38.8

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 14.7 – 30.2 – 34.5 – 20.5
Single modes 15.8 2.5 31.3 2.2 37.8 4.2 35.0
Truck 15.9 2.7 31.5 2.9 40.6 4.7 36.8
Rail 43.9 0.4 S S 46.9 2.5 29.1
All other Single modes 35.6 0.1 45.2 – 42.4 0.1 10.1
Multiple modes 17.4 2.5 21.7 0.3 27.6 3.4 15.5
Parcel, USPS or courier 19.4 2.8 28.0 0.3 31.3 1.5 16.0
All other multiple modes S S S S S S 15.1
Other and unknown modes 28.8 1.1 31.5 1.9 26.7 2.1 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 13.9 – 43.6 – 17.1 – 11.0
Single modes 18.6 4.6 47.9 5.1 21.5 4.7 21.9
Truck 23.0 5.6 48.3 5.3 22.1 5.0 28.6
Rail S S S S S S 29.0
All other Single modes 23.8 1.6 23.8 0.3 28.8 0.9 5.8
Multiple modes 20.5 4.4 22.5 2.1 17.1 2.5 8.5
Parcel, USPS or courier 20.6 4.4 22.8 2.0 16.2 2.3 8.5
All other multiple modes S S S S S S 21.1
Other and unknown modes 25.9 1.4 S S S S 25.0

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 17.5 – 26.0 – 25.9 – 10.0
Single modes 18.2 1.7 27.0 1.9 28.7 4.5 21.3
Truck 19.0 2.7 27.1 2.0 28.4 4.8 18.3
Rail 34.8 – 38.8 – 38.4 0.2 20.7
All other Single modes 38.8 1.6 S S S S 4.7
Multiple modes 19.2 1.4 26.2 0.9 33.6 3.5 10.3
Parcel, USPS or courier 19.5 1.3 28.7 0.8 32.5 1.5 10.3
All other multiple modes 31.7 0.2 S S S S 11.7
Other and unknown modes 29.1 0.9 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 S S S S 38.0 – 24.5
Single modes 31.2 12.7 S S 43.9 13.0 42.1
Truck 33.3 12.1 32.6 15.4 45.1 12.7 39.6
Rail – – – – – – –
All other Single modes S S S S S S 26.3
Multiple modes S S S S S S 27.1
Parcel, USPS or courier S S 38.8 1.4 46.1 5.1 27.1
All other multiple modes S S S S S S 31.6
Other and unknown modes S S S S S S 47.5

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.