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 6.5 5.2 14.7 11.0 6.4 16.6 15.7 4.5 22.4 7.1 6.4 14.1
01-05 Agriculture products and fish 23.5 14.7 40.9 S 24.4 S 38.2 30.4 56.1 39.0 24.9 50.2
06-09 Grains, alcohol, and tobacco products 12.8 7.4 16.4 14.6 9.5 17.5 10.9 17.2 22.6 16.8 12.2 69.7
10-14 Stones, non-metallic minerals, and metallic ores 14.1 17.1 17.1 15.5 14.6 17.9 28.4 16.6 18.2 42.9 34.6 34.3
15-19 Coal and petroleum products 21.9 10.2 65.7 29.8 10.9 67.7 28.0 34.9 123.7 11.5 40.3 45.0
20-24 Pharmaceutical and chemical products 22.4 4.9 81.2 48.6 10.7 97.6 45.3 7.3 114.0 21.7 12.8 30.1
25-30 Logs, wood products, and textile and leather 9.9 12.3 14.8 11.7 6.7 15.3 12.1 11.8 15.6 7.7 5.5 11.9
31-34 Base metal and machinery 9.4 10.6 16.0 28.7 25.0 45.2 6.8 9.0 10.9 13.4 9.7 26.5
35-38 Electronic, motorized vehicles, and precision instruments 9.6 15.6 33.2 20.9 16.4 54.0 22.8 10.5 53.7 9.7 11.9 26.2
39-43 Furniture, mixed freight and misc manufactured products 10.1 4.8 27.7 26.2 16.2 69.0 37.4 12.4 110.2 9.1 12.5 19.1
-- Commodity Unknown 47.5 S S S S S S S S 21.9 35.9 111.1

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.