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 8.9 6.1 13.8 9.6 6.3 12.4 18.0 8.1 24.7 10.0 7.6 13.1
01-05 Agriculture products and fish 27.4 7.8 24.3 40.5 16.6 44.4 S 29.7 S 27.9 21.5 83.8
06-09 Grains, alcohol, and tobacco products 7.9 6.5 11.4 11.4 6.6 14.3 25.2 8.2 40.4 S 10.0 S
10-14 Stones, non-metallic minerals, and metallic ores 45.9 14.9 64.8 15.2 13.8 19.2 21.4 22.7 20.5 16.3 25.0 24.9
15-19 Coal and petroleum products 13.3 8.8 20.4 13.4 12.1 17.5 26.3 13.4 45.5 S 22.4 S
20-24 Pharmaceutical and chemical products 7.0 6.0 10.8 23.4 29.2 44.6 20.9 20.1 42.2 8.0 11.0 14.7
25-30 Logs, wood products, and textile and leather 12.2 11.9 25.4 15.6 11.7 21.3 14.4 13.0 19.1 10.4 7.9 16.4
31-34 Base metal and machinery 7.3 6.6 9.5 14.3 6.9 16.4 21.4 5.6 20.1 6.7 15.9 13.1
35-38 Electronic, motorized vehicles, and precision instruments 23.5 15.2 45.4 25.8 9.0 54.6 30.7 10.0 67.5 20.5 6.7 18.4
39-43 Furniture, mixed freight and misc manufactured products 8.6 9.5 21.0 39.9 9.5 84.9 22.8 11.4 41.1 12.1 7.0 14.9
-- Commodity Unknown 20.2 27.6 12.1 37.2 34.3 13.1 47.7 17.1 118.4 27.8 19.1 29.9

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.