Table B-2b. Estimated Measures of Reliability for Export Shipment Characteristics by Domestic Mode: 2002 and 1997
Table B-2b. Estimated Measures of Reliability for Export Shipment Characteristics by Domestic Mode: 2002 and 1997
[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]
| Domestic mode of transportation | Value | Tons | Ton-miles | ||||||
|---|---|---|---|---|---|---|---|---|---|
| CV 02 | CV 97 | Std. error of percent change 1997-2002 | 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 | 15.0 | 13.2 | 22.6 |
| Single modes | 5.8 | 5.1 | 9.1 | 12.4 | 8.1 | 21.4 | 15.2 | 15.2 | 26.8 |
| Truck | 5.9 | 5.6 | 9.5 | 11.1 | 6.9 | 21.1 | 26.0 | 13.3 | 52.3 |
| Rail | 6.3 | 30.1 | 24.8 | 13.6 | 14.0 | 17.8 | 16.1 | 21.1 | 26.2 |
| Water | 20.2 | 16.4 | 39.0 | 21.4 | 16.1 | 51.6 | 17.5 | 15.5 | 23.0 |
| Air (including truck and air) | 9.9 | 24.6 | 35.0 | 24.1 | 16.0 | 42.7 | 31.5 | 31.0 | 101.8 |
| Pipeline | S | S | S | S | S | S | S | S | S |
| Multiple modes | 7.4 | 8.0 | 13.4 | 14.5 | 10.7 | 19.2 | 19.3 | 14.2 | 28.6 |
| Parcel, U.S.P.S. or courier | 8.1 | 11.5 | 19.9 | 7.8 | 11.4 | 21.1 | 14.4 | 15.9 | 65.5 |
| Truck and rail | 10.4 | 8.9 | 10.3 | 15.8 | 7.9 | 19.6 | 6.4 | 7.2 | 9.7 |
| All other multiple modes | 28.9 | 19.9 | 114.0 | 26.3 | 23.9 | 34.7 | 38.4 | 30.4 | 69.5 |
| Other and unknown modes | 16.4 | 6.5 | 3.7 | 21.1 | 19.2 | 2.1 | 22.2 | 18.8 | 3.6 |
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.