Table B-2a. Estimated Measures of Reliability for Export Shipment Characteristics by Domestic Mode: 2002
Monday, July 2, 2012
Table B-2a. Estimated Measures of Reliability for Export Shipment Characteristics by Domestic Mode: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| Domestic mode of transportation | Value | Tons | Ton-miles | |||
|---|---|---|---|---|---|---|
| CV 02 | Std. error of percent | CV 02 | Std. error of percent | CV 02 | Std. error of percent | |
| All modes | 4.9 | – | 11.8 | – | 15.0 | – |
| Single modes | 5.8 | 1.1 | 12.4 | 0.8 | 15.2 | 1.3 |
| Truck | 5.9 | 1.0 | 11.1 | 3.6 | 26.0 | 3.6 |
| Rail | 6.3 | 0.3 | 13.6 | 1.8 | 16.1 | 3.8 |
| Water | 20.2 | 0.7 | 21.4 | 4.1 | 17.5 | 1.9 |
| Air (including truck and air) | 9.9 | 1.0 | 24.1 | – | 31.5 | 0.3 |
| Pipeline | S | S | S | S | S | S |
| Multiple modes | 7.4 | 1.0 | 14.5 | 0.8 | 19.3 | 1.4 |
| Parcel, U.S.P.S. or courier | 8.1 | 0.8 | 7.8 | – | 14.4 | – |
| Truck and rail | 10.4 | 0.3 | 15.8 | 0.6 | 6.4 | 0.7 |
| All other multiple modes | 28.9 | – | 26.3 | 0.3 | 38.4 | 1.3 |
| Other and unknown modes | 16.4 | 0.4 | 21.1 | 0.3 | 22.2 | 0.2 |
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.