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]
|CV 02||CV 97||Std. error of percent change 1997-2002||CV 02||CV 02||Std. error of percent change 1997-2002|
|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|
– 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.