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]
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.
Updated: Saturday, May 20, 2017