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 5.1 8.3 10.8 11.8 5.0 13.8 10.6 4.7 12.1 7.2 10.5 16.1
01-05 Agriculture products and fish 13.7 9.4 15.5 23.9 10.8 24.7 22.3 9.1 29.3 28.6 S S
06-09 Grains, alcohol, and tobacco products 19.7 18.5 28.0 20.7 17.8 23.5 11.1 14.0 16.7 36.3 17.4 184.8
10-14 Stones, non-metallic minerals, and metallic ores 20.1 20.0 27.7 14.2 9.7 15.4 22.2 13.4 10.3 23.1 18.8 14.3
15-19 Coal and petroleum products 18.7 7.6 15.3 20.8 9.9 17.0 20.1 18.5 20.2 S 14.6 S
20-24 Pharmaceutical and chemical products 15.6 6.8 25.8 22.3 9.8 30.6 29.2 14.0 42.9 13.8 12.7 22.8
25-30 Logs, wood products, and textile and leather 14.9 28.7 24.6 29.3 11.4 35.1 20.8 7.2 23.3 7.5 6.7 12.3
31-34 Base metal and machinery 10.4 5.7 14.4 28.9 19.9 55.7 19.1 6.8 27.3 12.6 8.1 13.8
35-38 Electronic, motorized vehicles, and precision instruments 13.3 26.7 24.0 18.9 8.0 25.6 29.5 9.3 36.7 13.2 12.0 19.1
39-43 Furniture, mixed freight and misc manufactured products 8.7 5.2 23.5 16.6 15.1 54.1 12.8 7.5 26.2 8.2 10.9 14.0
-- Commodity Unknown 39.3 33.6 19.9 S 35.1 S S 48.1 S 33.4 42.5 42.7

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.