Table B-5c. Estimated Standard Error of Percentage for Export Shipment Characteristics by Commodity Group: Percent of Total for 2002 and 1997
[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]
|Std. error of percent 2002||Std. error of percent 1997||Std. error of percent 2002||Std. error of percent 1997|
|01-05||Agriculture products and fish||0.9||0.8||3.9||3.1|
|06-09||Grains, alcohol, and tobacco products||0.3||0.2||0.6||0.5|
|10-14||Stones, nonmetallic minerals, and metallic ores.||0.1||–||1.9||0.8|
|15-19||Coal and petroleum products||0.3||0.2||2.7||0.8|
|20-24||Pharmaceutical and chemical products||0.9||2.5||1.6||3.3|
|25-30||Logs, wood products, and textile and leather||0.5||0.4||0.8||1.4|
|31-34||Base metal and machinery||1.3||0.7||1.0||0.9|
|35-38||Electronic, motorized vehicles, and precision instruments||2.2||2.6||0.6||0.3|
|39-43||Furniture, mixed freight and misc. manufactured products||0.6||0.5||0.5||0.9|
– 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.
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.