Table B-7c. Estimated Standard Error of Percentage for Export Shipment Characteristics by Commodity Group and Export Mode: Percent of Total for 2002 and 1997

Table B-7c. Estimated Standard Error of Percentage for Export Shipment Characteristics by Commodity Group and Export Mode: Percent of Total for 2002 and 1997

[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]

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All Commodities

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes
Single modes 1.3 1.0 1.0 1.8
Truck 1.9 2.2 1.6 0.7
Rail 0.3 1.2 1.9 1.6
Water 1.0 1.4 3.2 2.3
Air (including truck and air) 1.3 2.8 0.2 0.2
Pipeline S S
Multiple modes 1.5 0.3 0.9 0.1
Parcel, U.S.P.S. or courier 0.5 0.3 0.1
Truck and rail
All other multiple modes 1.5 0.9
Other and unknown modes 0.3 0.8 0.4 1.7

SCTG 01-05, griculture products and fish

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 0.9 0.8 3.9 3.1
Single modes 0.9 0.6 3.7 2.9
Truck 0.3 0.4
Rail 0.7 0.2
Water 0.8 0.6 3.9 2.8
Air (including truck and air) S S
Pipeline S S
Multiple modes 0.3
Parcel, U.S.P.S. or courier S S
Truck and rail
All other multiple modes 0.3
Other and unknown modes 0.3 0.3 S

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

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 0.3 0.2 0.6 0.5
Single modes 0.3 0.2 0.6 0.5
Truck 0.3
Rail 0.1
Water 0.3 0.2 0.3 0.4
Air (including truck and air) S S
Pipeline S S
Multiple modes S
Parcel, U.S.P.S. or courier S S
Truck and rail
All other multiple modes
Other and unknown modes

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

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 0.1 1.9 0.8
Single modes 1.7 0.8
Truck 0.1
Rail 1.1 0.4
Water 1.1 0.8
Air (including truck and air) S S
Pipeline
Multiple modes S S 0.3 S
Parcel, U.S.P.S. or courier S S S S
Truck and rail
All other multiple modes S 0.3
Other and unknown modes

SCTG 15-19, Coal and petroleum products

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 0.3 0.2 2.7 0.8
Single modes 0.3 0.3 2.2 1.2
Truck 0.1 0.1 S S
Rail 0.4 0.4
Water 0.3 0.2 2.4 1.2
Air (including truck and air) S S S
Pipeline S S S S
Multiple modes S S S
Parcel, U.S.P.S. or courier S S S
Truck and rail
All other multiple modes S S
Other and unknown modes S 0.5

SCTG 20-24, Pharmaceutical and chemical products

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 0.9 2.5 1.6 3.3
Single modes 0.8 2.5 1.6 3.3
Truck 0.2 0.3 0.3 0.3
Rail 0.2 S 0.9 S
Water 0.4 1.2 1.8 1.3
Air (including truck and air) 0.4 0.4
Pipeline S S S S
Multiple modes 0.1
Parcel, U.S.P.S. or courier
Truck and rail
All other multiple modes 0.1
Other and unknown modes 0.1

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

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 0.5 0.4 0.8 1.4
Single modes 0.4 0.3 0.4 1.4
Truck 0.2 0.1 0.2 0.1
Rail S 0.3
Water 0.4 0.2 0.4 1.4
Air (including truck and air) 0.1
Pipeline S S S S
Multiple modes 0.2 0.5
Parcel, U.S.P.S. or courier
Truck and rail
All other multiple modes 0.2 0.5
Other and unknown modes 0.2

SCTG 31-34, Base metal and machinery

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 1.3 0.7 1.0 0.9
Single modes 1.1 0.6 1.1 0.9
Truck 0.7 0.1 0.4 0.3
Rail 0.1 0.1 0.2
Water 0.6 0.3 0.9 0.6
Air (including truck and air) 0.4 0.2 0.1
Pipeline S S S S
Multiple modes 0.1 0.1
Parcel, U.S.P.S. or courier 0.1
Truck and rail
All other multiple modes 0.1 0.1
Other and unknown modes 0.3 0.2 S

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

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 2.2 2.6 0.6 0.3
Single modes 2.4 2.5 0.6 0.2
Truck 1.9 2.1 0.4 0.1
Rail 0.3 0.2
Water 0.6 0.3 0.2
Air (including truck and air) 1.4 2.9
Pipeline S S S S
Multiple modes 1.6 0.2
Parcel, U.S.P.S. or courier 0.3 0.2
Truck and rail
All other multiple modes S
Other and unknown modes 0.3 0.4

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

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 0.6 0.5 0.5 0.9
Single modes 0.4 0.5 0.5 0.8
Truck 0.2 0.1 0.2 0.2
Rail 0.2
Water 0.3 0.2 0.4 1.0
Air (including truck and air) 0.2 0.3
Pipeline S S S S
Multiple modes 0.4 S
Parcel, U.S.P.S. or courier S S
Truck and rail
All other multiple modes 0.2
Other and unknown modes

Commodity unknown

Export mode of transportation Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
All modes 0.1 0.3 S 0.1
Single modes 0.2 S
Truck S
Rail S S S
Water S
Air (including truck and air) 0.2 S
Pipeline
Multiple modes S S S S
Parcel, U.S.P.S. or courier S S S S
Truck and rail
All other multiple modes S S
Other and unknown modes S S S S

KEY:
– Represents an estimate 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.

NOTE: The Introduction and appendixes give information on 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: Research and Innovative Technologies Administration, Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Export Data, March 2005.