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]

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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.