Table B-1a. Estimated Measures of Reliability for Export Shipment Characteristics by Export Mode: 2002
Monday, July 2, 2012
Table B-1a. Estimated Measures of Reliability for Export Shipment Characteristics by Export Mode: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| Export mode of transportation | Value | Tons | ||
|---|---|---|---|---|
| CV Value 02 | Std. error of percent | CV Tons 02 | Std. error of percent | |
| All modes | 4.9 | – | 11.8 | – |
| Single modes | 4.1 | 1.3 | 12.4 | 1.0 |
| Truck | 6.4 | 1.9 | 6.5 | 1.6 |
| Rail | 8.9 | 0.3 | 16.2 | 1.9 |
| Water | 6.2 | 1.0 | 15.9 | 3.2 |
| Air (including truck and air) | 7.5 | 1.3 | 11.2 | 0.2 |
| Pipeline | S | S | S | S |
| Multiple modes | 18.2 | 1.5 | 14.7 | 0.9 |
| Parcel, U.S.P.S. or courier | 11.0 | 0.5 | 31.4 | – |
| Truck and rail | – | – | – | – |
| All other multiple modes | 27.7 | 1.5 | 15.2 | 0.9 |
| Other and unknown modes | 13.8 | 0.3 | 28.6 | 0.4 |
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.
CV Coefficient of variation of number
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.