Table B-3a. Estimated Measures of Reliability for Shipment Characteristics by Distance Shipped: 2002
Monday, July 2, 2012
Table B-3a. Estimated Measures of Reliability for Shipment Characteristics by Distance Shipped: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
| Distance Shipped (Based on Great Circle Distance) | Value | Tons | Ton-miles | |||
|---|---|---|---|---|---|---|
| Coefficient of variation of number | Standard error of percent | Coefficient of variation of number | Standard error of percent | Coefficient of variation of number | Standard error of percent | |
| All distances | 1.3 | – | 2.0 | – | 3.7 | – |
| Less than 50 miles | 1.4 | 0.4 | 3.2 | 1.0 | 3.9 | 0.2 |
| 50 to 99 miles | 1.8 | 0.2 | 5.8 | 0.5 | 5.8 | 0.2 |
| 100 to 249 miles | 2.0 | 0.3 | 2.9 | 0.4 | 2.8 | 0.4 |
| 250 to 499 miles | 2.3 | 0.2 | 3.2 | 0.4 | 3.9 | 0.8 |
| 500 to 749 miles | 3.4 | 0.3 | 3.1 | 0.2 | 3.6 | 0.6 |
| 750 to 999 miles | 4.0 | 0.2 | 6.2 | 0.2 | 6.4 | 0.7 |
| 1,000 to 1,499 miles | 3.3 | 0.2 | 11.2 | 0.4 | 12.0 | 1.7 |
| 1,500 to 1,999 miles | 5.8 | 0.2 | 6.9 | – | 7.0 | 0.4 |
| 2,000 miles or more | 6.3 | 0.2 | 3.9 | – | 4.3 | 0.2 |
KEY:
– Represents data cell 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 onf 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: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, United States Data, December 2004.