Table B-1b. Estimated Measures of Reliability for Export Shipment Characteristics by Export Mode: 2002 and 1997
Table B-1b. Estimated Measures of Reliability for Export Shipment Characteristics by Export Mode: 2002 and 1997
[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]
| Export mode of transportation | Value | Tons | ||||
|---|---|---|---|---|---|---|
| CV 02 | CV 97 | Std. error of percent change 1997-2002 | CV 02 | CV 97 | Std. error of percent change 1997-2002 | |
| All modes | 4.9 | 3.8 | 6.6 | 11.8 | 7.3 | 15.2 |
| Single modes | 4.1 | 4.7 | 6.5 | 12.4 | 7.9 | 16.3 |
| Truck | 6.4 | 13.1 | 19.9 | 6.5 | 8.4 | 12.1 |
| Rail | 8.9 | 37.7 | 29.8 | 16.2 | 30.4 | 46.9 |
| Water | 6.2 | 6.4 | 9.0 | 15.9 | 7.6 | 18.8 |
| Air (including truck and air) | 7.5 | 9.0 | 10.8 | 11.2 | 7.8 | 11.4 |
| Pipeline | S | 35.4 | S | S | 34.0 | S |
| Multiple modes | 18.2 | 8.3 | 92.0 | 14.7 | 27.7 | 883.0 |
| Parcel, U.S.P.S. or courier | 11.0 | 8.3 | 21.6 | 31.4 | 27.7 | 28.4 |
| Truck and rail | – | – | – | – | – | – |
| All other multiple modes | 27.7 | – | – | 15.2 | – | – |
| Other and unknown modes | 13.8 | 6.8 | 4.5 | 28.6 | 24.6 | 11.4 |
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.