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 3.4 2.0 5.0 10.5 13.3 18.1 3.1 3.7 5.6 8.2 6.1 10.3
01-05 Agriculture products and fish 18.5 4.1 14.0 14.8 9.5 15.0 3.9 5.6 6.7 26.3 18.5 25.9
06-09 Grains, alcohol, and tobacco products 13.7 5.2 14.8 11.6 7.5 16.1 9.2 10.7 15.1 42.5 23.1 22.3
10-14 Stones, non-metallic minerals, and metallic ores 38.5 23.2 63.8 46.2 27.2 71.7 33.3 20.9 67.2 38.1 30.4 26.7
15-19 Coal and petroleum products 20.5 14.3 34.2 14.5 12.0 17.0 31.5 11.2 24.2 25.9 11.2 27.7
20-24 Pharmaceutical and chemical products 20.6 6.4 25.6 27.9 8.1 38.7 34.6 7.3 79.8 17.9 5.6 13.6
25-30 Logs, wood products, and textile and leather 11.6 6.6 13.7 20.4 21.3 29.8 21.3 12.1 24.2 11.0 7.3 12.4
31-34 Base metal and machinery 12.7 3.6 13.3 27.8 S S 13.2 12.7 18.5 10.1 8.8 11.3
35-38 Electronic, motorized vehicles, and precision instruments 12.4 7.5 16.2 45.3 8.8 87.3 S 12.4 S 5.9 8.0 14.6
39-43 Furniture, mixed freight and misc manufactured products 15.0 8.6 49.3 37.6 15.0 135.2 18.8 20.8 60.3 10.5 6.2 9.9
-- Commodity Unknown 23.7 26.4 10.9 S 48.2 S S 28.4 S 26.4 20.6 29.2

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.