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 4.0 3.4 6.1 9.6 8.5 15.2 5.8 4.6 9.3 8.4 4.7 11.0
01-05 Agriculture products and fish 18.8 5.6 25.9 33.8 13.1 51.2 22.6 11.2 54.3 41.9 24.4 65.2
06-09 Grains, alcohol, and tobacco products 11.7 4.5 14.0 10.5 9.4 13.5 12.8 8.4 18.2 18.5 21.4 34.6
10-14 Stones, non-metallic minerals, and metallic ores 10.8 21.6 22.8 23.9 23.3 37.6 20.5 17.7 44.5 S 29.4 S
15-19 Coal and petroleum products 8.7 9.9 14.9 8.7 8.7 13.1 17.5 13.3 27.0 S 24.4 S
20-24 Pharmaceutical and chemical products 6.7 4.9 9.9 29.4 20.1 68.2 19.1 5.9 30.5 13.2 8.1 21.1
25-30 Logs, wood products, and textile and leather 15.3 7.1 19.0 12.6 11.5 12.5 8.4 8.7 9.4 6.5 6.9 9.3
31-34 Base metal and machinery 11.2 4.0 14.1 21.9 10.8 35.8 26.6 7.7 34.5 18.7 8.4 22.5
35-38 Electronic, motorized vehicles, and precision instruments 7.7 3.9 9.2 34.5 10.7 59.0 11.5 20.4 19.6 7.5 5.1 10.3
39-43 Furniture, mixed freight and misc manufactured products 9.8 21.3 34.4 17.1 14.9 30.3 14.1 26.6 30.5 13.6 8.1 14.6
-- Commodity Unknown 42.4 28.3 28.3 40.9 S S 34.3 31.3 12.0 17.4 25.0 34.5

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.