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 8.8 6.4 10.9 17.3 13.2 22.8 8.4 21.6 10.4 14.4 7.6 35.8
01-05 Agriculture products and fish 27.7 36.0 53.0 43.3 S S 46.2 S S 27.7 S S
06-09 Grains, alcohol, and tobacco products 16.5 13.3 18.6 20.1 16.1 23.3 26.7 24.5 23.0 S 23.0 S
10-14 Stones, non-metallic minerals, and metallic ores 24.3 19.5 24.3 7.1 18.6 20.3 22.3 23.6 25.7 13.1 S S
15-19 Coal and petroleum products 23.7 12.5 32.0 26.6 10.2 18.7 27.5 18.6 36.2 24.2 18.7 131.5
20-24 Pharmaceutical and chemical products 38.9 16.7 64.8 27.6 10.0 53.2 9.6 17.3 10.2 21.4 9.5 20.4
25-30 Logs, wood products, and textile and leather 9.8 9.8 18.4 8.0 14.6 21.8 15.3 19.6 35.1 11.2 8.2 22.9
31-34 Base metal and machinery 11.4 14.4 14.7 44.1 17.1 88.7 14.1 29.1 12.8 22.5 13.9 22.1
35-38 Electronic, motorized vehicles, and precision instruments 11.8 9.2 9.6 19.4 15.2 14.2 13.3 14.3 16.3 13.9 12.4 26.2
39-43 Furniture, mixed freight and misc manufactured products 29.6 21.3 54.6 40.0 41.0 34.6 27.3 36.4 7.7 15.9 10.4 33.5
-- Commodity Unknown 39.1 43.4 7.5 45.8 43.1 32.8 S 34.2 S 38.5 24.6 33.2

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.