Table B-10. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group for State of Origin: 2002 and 1997

Table B-10. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group for State of Origin: 2002 and 1997

[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]

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Code Commodity (2-digit SCTG) Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
  All Commodities 5.7 8.0 11.7 6.4 8.4 7.7 11.7 8.4 17.0 8.3 11.6 11.5
01-05 Agriculture products and fish 27.1 16.8 29.8 31.8 19.3 22.6 S 13.2 S 31.2 28.1 40.3
06-09 Grains, alcohol, and tobacco products 13.5 7.6 16.1 16.7 6.7 20.5 13.1 6.1 12.7 30.8 35.8 44.6
10-14 Stones, non-metallic minerals, and metallic ores 16.3 16.3 15.6 19.3 13.0 16.9 S 22.8 S 10.0 28.9 21.1
15-19 Coal and petroleum products 21.3 10.4 15.9 13.8 10.2 11.8 24.1 20.4 44.3 38.4 13.7 168.3
20-24 Pharmaceutical and chemical products 15.9 8.0 39.1 18.0 17.5 35.5 20.1 18.9 37.4 12.7 8.2 15.1
25-30 Logs, wood products, and textile and leather 11.3 27.4 25.9 18.2 6.7 19.1 9.0 16.9 14.7 8.7 12.0 18.4
31-34 Base metal and machinery 4.2 3.1 4.5 16.8 23.6 15.4 7.2 6.9 7.6 13.8 20.0 18.3
35-38 Electronic, motorized vehicles, and precision instruments 8.5 11.6 17.2 19.7 12.3 29.7 14.0 21.4 19.9 14.5 16.0 13.4
39-43 Furniture, mixed freight and misc manufactured products 4.0 4.8 10.7 22.1 S S S 36.9 S 19.5 11.5 6.9
-- Commodity Unknown 40.5 16.8 51.5 46.3 46.5 185.8 S 36.5 S 19.6 15.2 20.6

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

NOTE: The Introduction and appendixes give information onf 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, Individual State Data, December 2004.