Table B-12. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group for the United States: 2002 and 1997
Monday, July 2, 2012
Table B-12. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group for the United States: 2002 and 1997
[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]
| SCTG code | Commodity description | Value | Tons | Ton-miles | Average miles
per shipment |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CV 2002 |
CV 1997 |
Std. error of percent | CV 2002 |
CV 1997 |
Std. error of percent | CV 2002 |
CV 1997 |
Std. error of percent | CV 2002 |
CV 1997 |
Std. error of percent | ||
| Total | 1.3 | 0.9 | 2.0 | 2.0 | 1.6 | 2.8 | 3.7 | 2.3 | 5.3 | 2.9 | 2.6 | 4.4 | |
| 01-05 | Agriculture products and fish | 3.2 | 2.5 | 4.3 | 4.9 | 3.4 | 6.8 | 10.1 | 5.3 | 14.6 | 11.7 | 11.4 | 18.4 |
| 06-09 | Grains, alcohol, and tobacco products | 3.5 | 2.7 | 4.8 | 4.3 | 2.8 | 5.7 | 5.0 | 2.6 | 6.6 | 11.6 | 13.2 | 23.6 |
| 10-14 | Stones, non-metallic minerals, and metallic ores | 6.5 | 5.4 | 8.7 | 7.3 | 3.9 | 8.4 | 9.7 | 5.6 | 13.0 | 9.6 | 6.5 | 10.2 |
| 15-19 | Coal and petroleum products | 3.3 | 3.4 | 5.8 | 4.4 | 2.7 | 5.6 | 12.3 | 6.9 | 17.3 | 10.7 | 14.1 | 20.3 |
| 20-24 | Pharmaceutical and chemical products | 4.2 | 2.9 | 7.0 | 9.5 | 4.2 | 13.0 | 7.0 | 7.1 | 11.6 | 3.9 | 3.7 | 5.5 |
| 25-30 | Logs, wood products, and textile and leather | 3.6 | 5.3 | 6.8 | 8.8 | 3.6 | 10.4 | 5.7 | 3.8 | 7.7 | 2.5 | 4.5 | 6.1 |
| 31-34 | Base metal and machinery | 3.8 | 1.3 | 4.4 | 6.2 | 6.3 | 9.4 | 5.9 | 3.0 | 7.8 | 4.3 | 4.7 | 6.3 |
| 35-38 | Electronic, motorized
vehicles, and precision instruments |
4.6 | 1.8 | 5.8 | 6.4 | 2.9 | 10.6 | 7.3 | 3.2 | 10.5 | 3.6 | 2.5 | 5.5 |
| 39-43 | Furniture and miscellaneous manufactured products | 2.4 | 3.4 | 7.4 | 7.1 | 6.2 | 14.0 | 9.0 | 5.4 | 14.3 | 6.4 | 4.3 | 6.9 |
| -- | Commodity Unknown | 9.9 | 11.0 | 7.0 | 22.3 | 18.1 | 20.0 | 41.7 | 15.5 | 47.5 | 8.8 | 9.7 | 13.1 |
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.
CV Coefficient of variation of number.
NOTES: 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: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, United States Data, December 2004.