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 6.0 5.1 10.1 9.6 10.6 14.8 15.8 6.4 23.4 14.8 5.0 19.6
01-05 Agriculture products and fish 20.6 10.8 22.5 39.6 22.8 43.1 42.3 16.4 92.9 S 24.5 S
06-09 Grains, alcohol, and tobacco products 12.9 13.9 40.3 19.3 19.5 61.7 21.9 20.9 61.9 S 30.3 S
10-14 Stones, non-metallic minerals, and metallic ores 20.3 S S 21.9 35.8 38.5 34.3 20.4 51.7 17.0 27.4 32.5
15-19 Coal and petroleum products 16.5 13.9 22.9 13.1 10.1 13.9 13.9 15.2 14.4 18.3 14.3 22.0
20-24 Pharmaceutical and chemical products 9.8 8.8 20.3 27.4 23.7 55.7 38.6 24.7 92.0 14.0 14.3 37.2
25-30 Logs, wood products, and textile and leather 28.3 9.4 37.8 24.5 15.9 26.9 12.9 14.5 16.7 10.2 11.3 15.1
31-34 Base metal and machinery 25.1 3.3 28.2 34.3 4.9 42.6 47.7 11.2 93.5 15.2 8.4 22.8
35-38 Electronic, motorized vehicles, and precision instruments 12.1 11.7 19.0 16.8 11.1 27.9 18.5 13.5 27.0 36.2 13.3 22.1
39-43 Furniture, mixed freight and misc manufactured products 12.3 18.6 33.4 21.3 12.2 28.0 11.8 12.5 16.5 10.1 9.5 18.3
-- Commodity Unknown 47.3 S S 41.6 S S S S S 23.8 36.9 93.8

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.