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 19.6 10.5 26.8 23.8 9.4 33.1 9.2 5.8 10.2 12.0 16.4 14.6
01-05 Agriculture products and fish 19.0 7.6 15.0 29.4 22.4 27.3 30.6 15.6 24.2 S S S
06-09 Grains, alcohol, and tobacco products 17.3 8.1 19.1 21.4 8.7 24.4 30.0 11.7 31.7 29.6 11.6 50.2
10-14 Stones, non-metallic minerals, and metallic ores 38.5 31.5 138.4 S 25.6 S 48.4 25.1 217.7 S 18.3 S
15-19 Coal and petroleum products 14.5 15.4 30.7 14.4 16.4 30.3 17.2 28.8 28.6 48.4 39.5 66.0
20-24 Pharmaceutical and chemical products 12.8 8.2 12.3 35.9 12.3 20.3 21.6 18.0 6.7 27.7 17.0 84.9
25-30 Logs, wood products, and textile and leather 7.9 7.7 10.5 17.3 9.0 23.5 22.9 11.0 29.9 18.7 10.4 19.0
31-34 Base metal and machinery 22.5 4.0 21.9 21.4 10.3 8.1 18.8 9.4 12.4 19.0 20.9 28.3
35-38 Electronic, motorized vehicles, and precision instruments 43.6 27.3 66.8 14.9 11.0 22.8 22.0 22.5 29.3 37.9 20.3 37.0
39-43 Furniture, mixed freight and misc manufactured products 25.4 18.9 67.2 23.3 28.4 45.1 22.1 12.6 42.6 17.7 15.8 12.2
-- Commodity Unknown 44.8 41.0 18.7 40.7 S S S 47.2 S 40.7 40.5 71.9

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.