Table B-5c. Estimated Standard Error of Percentage for Export Shipment Characteristics by Commodity Group: Percent of Total for 2002 and 1997

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]

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SCTG code Description Value Tons
Std. error of percent 2002 Std. error of percent 1997 Std. error of percent 2002 Std. error of percent 1997
  All Commodities
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
-- Commodity unknown 0.1 0.3 S 0.1

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.

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.