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 4.9 4.6 9.1 11.9 10.8 19.0 8.6 6.4 15.4 15.3 9.4 29.0
01-05 Agriculture products and fish 19.2 13.4 16.3 25.6 10.3 34.8 26.0 13.7 56.0 S 14.5 S
06-09 Grains, alcohol, and tobacco products 21.0 7.8 28.3 22.8 11.2 32.9 22.2 9.0 24.0 S 26.5 S
10-14 Stones, non-metallic minerals, and metallic ores 20.6 16.9 31.6 30.1 22.2 37.3 25.6 18.9 30.3 45.6 23.4 37.5
15-19 Coal and petroleum products 27.5 21.2 44.0 18.1 25.2 34.2 16.7 24.7 35.3 18.1 25.0 47.9
20-24 Pharmaceutical and chemical products 22.4 22.4 38.3 23.6 25.2 40.0 24.0 21.0 61.4 25.3 11.7 20.7
25-30 Logs, wood products, and textile and leather 9.8 21.4 23.0 26.6 9.5 43.1 40.5 14.4 73.5 11.1 11.1 19.0
31-34 Base metal and machinery 12.5 5.3 17.2 13.6 6.7 19.3 9.7 9.0 17.2 16.3 15.4 21.4
35-38 Electronic, motorized vehicles, and precision instruments 9.3 7.1 17.4 18.5 7.2 31.0 18.4 8.0 31.9 15.8 9.4 47.5
39-43 Furniture, mixed freight and misc manufactured products 12.9 8.7 38.6 15.7 11.1 33.4 19.8 10.3 44.6 18.9 8.5 14.7
-- Commodity Unknown 30.7 S S S 34.8 S 28.5 41.6 10.5 S 26.1 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.