Table B-5b. Estimated Measures of Reliability for Export Shipment Characteristics by Commodity Group: 2002 and 1997
Table B-5b. Estimated Measures of Reliability for Export Shipment Characteristics by Commodity Group: 2002 and 1997
[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]
| SCTG code | Description | Value | Tons | ||||
|---|---|---|---|---|---|---|---|
| CV 02 | CV 97 | Std. error of percent change 1997-2002 | CV 02 | CV 02 | Std. error of percent change 1997-2002 | ||
| All Commodities | 4.9 | 3.8 | 6.6 | 11.8 | 7.3 | 15.2 | |
| 01-05 | Agriculture products and fish | 14.1 | 8.1 | 18.0 | 17.4 | 12.2 | 30.0 |
| 06-09 | Grains, alcohol, and tobacco products | 18.3 | 5.9 | 21.7 | 13.8 | 10.6 | 16.8 |
| 10-14 | Stones, nonmetallic minerals, and metallic ores. | 16.9 | 14.2 | 25.9 | 23.9 | 13.2 | 48.1 |
| 15-19 | Coal and petroleum products | 31.2 | 13.5 | 30.1 | 24.2 | 7.5 | 16.4 |
| 20-24 | Pharmaceutical and chemical products | 7.2 | 23.0 | 23.3 | 23.2 | 37.2 | 48.1 |
| 25-30 | Logs, wood products, and textile and leather | 7.3 | 3.4 | 8.2 | 11.0 | 17.5 | 17.2 |
| 31-34 | Base metal and machinery | 7.0 | 3.5 | 8.4 | 12.4 | 12.4 | 23.3 |
| 35-38 | Electronic, motorized vehicles, and precision instruments | 8.5 | 7.2 | 12.4 | 10.1 | 3.8 | 14.0 |
| 39-43 | Furniture, mixed freight and misc. manufactured products | 8.2 | 8.7 | 13.6 | 15.4 | 8.2 | 11.1 |
| -- | Commodity unknown | 32.1 | 28.5 | 15.0 | S | 44.7 | S |
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.