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 9.5 6.1 15.0 10.5 12.5 14.2 5.7 9.8 13.8 15.4 5.2 25.2
01-05 Agriculture products and fish 22.4 4.8 23.9 27.7 15.9 14.1 24.4 16.2 26.2 39.6 26.4 108.6
06-09 Grains, alcohol, and tobacco products 26.3 36.4 26.8 29.1 34.3 30.8 30.1 18.8 28.6 16.0 23.1 72.0
10-14 Stones, non-metallic minerals, and metallic ores 47.7 16.7 55.2 20.7 34.8 37.0 15.6 19.8 38.8 S S S
15-19 Coal and petroleum products 39.2 17.3 33.1 42.8 17.1 26.7 S 15.7 S 21.1 13.3 71.5
20-24 Pharmaceutical and chemical products 8.7 8.9 11.2 16.8 11.5 15.9 14.9 18.0 22.8 38.1 17.7 31.5
25-30 Logs, wood products, and textile and leather 35.8 4.9 48.4 35.0 8.9 50.9 23.8 8.0 28.4 13.1 7.7 16.5
31-34 Base metal and machinery 7.6 18.9 20.3 17.0 37.6 31.1 15.9 29.9 40.6 23.1 14.7 22.6
35-38 Electronic, motorized vehicles, and precision instruments 34.6 7.8 100.3 48.0 12.6 154.5 S 14.0 S 13.0 24.2 64.2
39-43 Furniture, mixed freight and misc manufactured products 15.2 29.9 86.1 12.6 34.5 61.7 18.8 25.0 47.7 13.6 10.1 16.2
-- Commodity Unknown 42.0 S S S S S 39.0 S S 29.9 30.6 115.1

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.