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 3.6 3.4 6.1 12.4 11.1 16.4 7.1 6.6 10.9 9.2 6.4 13.1
01-05 Agriculture products and fish 18.5 5.8 29.0 24.0 10.7 27.8 14.8 8.8 25.1 10.1 46.8 313.0
06-09 Grains, alcohol, and tobacco products 14.7 11.1 24.8 13.4 22.8 28.5 13.0 21.3 33.8 32.0 17.1 70.1
10-14 Stones, non-metallic minerals, and metallic ores 25.3 11.1 32.3 28.5 25.1 33.4 20.2 10.1 26.5 39.6 33.3 87.1
15-19 Coal and petroleum products 19.7 37.7 41.1 32.3 42.5 55.9 38.4 41.2 24.9 19.3 13.9 10.0
20-24 Pharmaceutical and chemical products 14.3 6.5 21.4 11.8 10.1 13.4 15.0 8.3 17.1 12.7 14.4 17.9
25-30 Logs, wood products, and textile and leather 12.4 4.7 15.4 9.4 10.6 18.1 8.3 9.6 14.6 9.2 7.7 14.3
31-34 Base metal and machinery 14.6 7.6 18.3 19.9 23.8 27.2 29.1 12.4 44.1 11.8 13.1 16.5
35-38 Electronic, motorized vehicles, and precision instruments 14.3 6.7 14.0 18.3 13.0 23.3 18.6 13.4 17.7 10.3 13.0 21.6
39-43 Furniture, mixed freight and misc manufactured products 12.6 17.3 41.3 18.1 13.4 19.8 8.3 18.2 12.9 17.3 9.5 23.5
-- Commodity Unknown 42.1 26.7 36.1 S 43.3 S S 38.1 S 18.9 22.8 40.1

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.