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 3.7 6.3 7.7 8.0 5.0 11.4 8.0 11.4 15.6 7.3 6.9 8.9
01-05 Agriculture products and fish 15.0 13.8 24.4 24.8 8.6 34.9 22.0 12.3 40.7 S 26.5 S
06-09 Grains, alcohol, and tobacco products 12.5 19.3 15.2 25.3 7.7 23.0 31.0 7.6 28.1 25.1 34.5 26.6
10-14 Stones, non-metallic minerals, and metallic ores 14.0 20.0 21.1 27.6 16.8 34.8 17.4 12.4 16.5 S 18.5 S
15-19 Coal and petroleum products 18.3 7.4 26.0 16.2 9.2 22.5 16.2 19.7 29.6 30.4 26.7 50.8
20-24 Pharmaceutical and chemical products 11.1 17.1 20.8 21.0 18.7 35.7 16.9 26.2 26.6 10.0 11.1 19.4
25-30 Logs, wood products, and textile and leather 11.7 19.7 18.7 20.4 12.0 25.4 19.1 5.0 22.8 11.5 11.5 20.7
31-34 Base metal and machinery 10.4 4.4 13.8 10.5 9.0 17.6 17.6 9.9 33.8 11.8 12.3 15.1
35-38 Electronic, motorized vehicles, and precision instruments 12.3 17.8 17.8 22.7 12.2 47.0 21.1 11.8 44.3 14.3 9.7 13.3
39-43 Furniture, mixed freight and misc manufactured products 9.7 19.5 32.8 16.4 14.1 30.9 12.8 10.9 18.8 11.3 12.3 11.9
-- Commodity Unknown S 16.0 S S 28.3 S S 26.5 S S 11.7 S

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.