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 8.5 5.3 13.4 5.1 7.4 10.2 6.6 13.8 14.1 8.0 10.8 12.7
01-05 Agriculture products and fish 20.2 11.4 21.5 25.3 17.0 23.0 43.8 23.6 51.3 34.8 26.4 80.7
06-09 Grains, alcohol, and tobacco products 33.9 23.9 54.1 13.8 9.2 18.1 16.4 13.3 26.5 24.8 12.6 66.4
10-14 Stones, non-metallic minerals, and metallic ores 18.7 14.0 35.1 14.8 18.7 28.3 14.3 17.8 37.6 21.6 12.0 34.1
15-19 Coal and petroleum products 12.2 13.7 22.2 14.3 16.3 20.4 17.8 26.9 21.0 19.7 44.8 27.7
20-24 Pharmaceutical and chemical products 14.4 12.1 23.1 20.7 17.3 30.0 18.8 15.7 43.3 17.3 19.1 31.5
25-30 Logs, wood products, and textile and leather 11.1 3.0 12.0 31.3 7.6 51.9 11.5 4.0 12.7 12.4 8.4 15.9
31-34 Base metal and machinery 7.0 5.8 12.1 27.9 13.2 42.5 24.3 5.8 36.8 22.4 12.4 29.2
35-38 Electronic, motorized vehicles, and precision instruments 13.9 6.9 23.7 26.9 11.8 49.5 29.8 12.2 44.9 16.0 7.2 23.6
39-43 Furniture, mixed freight and misc manufactured products 31.7 8.1 71.4 27.2 18.4 44.2 16.4 12.6 18.4 16.7 13.1 9.6
-- Commodity Unknown 23.3 S S 29.8 S S 49.9 S S S 22.7 S

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.