Table B-20 - Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for State of Origin: 2002 and 1997

Table B-20 - Estimated Measures of Reliability for Shipment Characteristics by Commodity Group and Mode of Transportation for State of Origin: 2002 and 1997

[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 Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes 40.9 21.0 127.1 46.0 37.6 47.8 29.4 30.0 66.0 43.8 S S
Single modes 42.7 25.5 165.1 45.7 37.8 47.5 33.8 33.1 85.1 27.9 S S
Truck 42.7 25.9 169.2 45.7 37.8 47.5 33.8 38.5 102.7 30.7 25.2 52.2
Rail S S S S S S 31.6
Water S S S S S S 30.0
Air (including truck and air) S S S S S S 26.1
Pipeline S S S S S S
Multiple modes 29.7 S S 40.0 S S S S S 14.8 31.1 49.2
Parcel, USPS or courier 29.7 S S 40.0 S S S S S 14.8 31.1 49.2
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S 21.0 S S

SCTG 01-05, Agriculture products and fish

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes 48.5 S S S S S S S S 32.4 31.3 35.2
Single modes S S S S S S S S S 24.4 31.3 35.1
Truck S S S S S S S S S 24.4 31.3 35.1
Rail
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes S S S S S S 31.6
Parcel, USPS or courier S S S S S S 31.6
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S 29.9

SCTG 06-09, Grains, alcohol, and tobacco products

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes 23.1 34.6 39.5 27.4 S S 29.2 46.3 26.8 38.0 29.8 162.9
Single modes 23.4 34.6 39.1 28.4 S S 30.5 46.2 26.5 14.7 29.8 32.2
Truck 23.4 34.6 39.1 28.4 S S 30.5 46.2 26.5 14.7 29.8 32.2
Rail
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes
Parcel, USPS or courier
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S 30.0 31.6 S

SCTG 10-14, Stones, non-metallic minerals, and metallic ores

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes S S S S S S S S S 31.6 31.6 287.7
Single modes S S S S S S 31.6
Truck S S S S S S 31.6
Rail
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes
Parcel, USPS or courier
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S 31.6

SCTG 15-19, Coal and petroleum products

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes S S S S S S 31.6
Single modes S S S S S S 31.6
Truck S S S S S S 31.6
Rail
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes
Parcel, USPS or courier
Truck and rail
Other multiple modes
Other and unknown modes

SCTG 20-24, Pharmaceutical and chemical products

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes S S S 42.0 S S S S S 37.4 28.2 631.1
Single modes S S S 42.2 S S S S S 38.1 28.7 21.5
Truck S S S 42.2 S S S S S 38.1 28.7 21.5
Rail
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes S S S S S S 30.3
Parcel, USPS or courier S S S S S S 30.3
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S 28.9 30.7 8.8

SCTG 25-30, Logs, wood products, and textile and leather

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes S 46.6 S 38.9 35.7 39.5 41.6 S S 28.0 33.9 33.6
Single modes S S S 40.1 38.8 44.0 47.2 S S 46.6 27.7 50.4
Truck S S S 40.1 38.8 44.0 47.2 S S 46.8 27.7 50.2
Rail
Water
Air (including truck and air) S S S S S S 29.9
Pipeline S S S S S S
Multiple modes 45.6 S S S S S S S S 16.8 31.5 51.3
Parcel, USPS or courier 45.6 S S S S S S S S 16.8 31.5 51.3
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S S S 33.4 S

SCTG 31-34, Base metal and machinery

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes 32.7 41.7 23.3 S 46.1 S S 49.9 S S S S
Single modes 42.9 43.9 29.3 S 46.2 S S S S S S S
Truck 42.9 43.9 29.3 S 46.2 S S S S S S S
Rail
Water
Air (including truck and air)
Pipeline S S S S S S
Multiple modes 35.3 S S 28.6 S S 28.5 S S 33.6 31.6 28.1
Parcel, USPS or courier 35.3 S S 28.6 S S 28.5 S S 33.6 31.6 28.1
Truck and rail
Other multiple modes
Other and unknown modes 40.2 S S S S S S S S S S S

SCTG 35-38, Electronic, motorized vehicles, and precision instruments

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes S S S 43.8 S S S S S S 31.6 S
Single modes S S S 46.2 S S S S S S 31.6 S
Truck S S S 46.2 S S S S S S 31.6 S
Rail S S S S S S 31.6
Water
Air (including truck and air) S S S S S S 29.9
Pipeline S S S S S S
Multiple modes S S S 44.8 S S 35.9 S S 35.5 31.6 987.4
Parcel, USPS or courier S S S 44.8 S S 35.9 S S 35.5 31.6 987.4
Truck and rail
Other multiple modes
Other and unknown modes S S S S S S S S

SCTG 39-43, Furniture, mixed freight and misc manufactured products

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes 30.8 48.3 206.6 24.6 S S 28.5 S S 35.0 41.1 61.0
Single modes 34.1 S S 25.5 S S 34.8 S S S S S
Truck 35.3 S S 25.5 S S 35.1 S S 22.8 S S
Rail
Water S S S S S S 31.6
Air (including truck and air) S S S S S S 31.6
Pipeline S S S S S S
Multiple modes 49.9 S S S S S S S S 27.0 31.6 56.5
Parcel, USPS or courier 49.9 S S S S S S S S 27.0 31.6 56.5
Truck and rail
Other multiple modes
Other and unknown modes S S S 46.4 S S S S S 23.7 S S

Commodity Unknown

Mode of transportation Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
All modes S S S S S S S S S S 31.6 S
Single modes S S S S S S S S S 31.6 31.6 0.5
Truck S S S S S S 31.6
Rail
Water S S S S S S 31.6
Air (including truck and air)
Pipeline S S S S S S
Multiple modes S S S S S S 43.7
Parcel, USPS or courier S S S S S S 43.7
Truck and rail
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, Individual State Data, December 2004.