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 6.6 6.3 11.8 16.3 5.3 23.6 14.2 8.3 15.8 15.0 10.9 29.8
01-05 Agriculture products and fish 9.5 16.2 22.9 21.6 8.4 32.4 23.6 16.9 31.3 49.3 29.4 46.7
06-09 Grains, alcohol, and tobacco products 17.3 10.5 19.1 29.6 13.5 46.9 26.8 25.5 46.5 31.1 46.3 41.8
10-14 Stones, non-metallic minerals, and metallic ores 38.6 26.2 47.5 25.9 20.7 49.3 40.1 20.2 40.8 39.1 21.1 35.7
15-19 Coal and petroleum products 22.7 17.3 38.5 25.2 22.1 36.5 26.3 27.8 14.7 37.1 31.1 20.4
20-24 Pharmaceutical and chemical products 21.5 7.5 23.5 20.9 18.7 15.3 26.5 24.2 13.4 21.4 11.8 35.3
25-30 Logs, wood products, and textile and leather 40.1 35.4 57.2 11.3 13.1 9.4 29.5 21.3 20.9 10.2 11.8 26.2
31-34 Base metal and machinery 31.9 5.7 39.2 40.7 9.8 101.2 38.1 10.9 90.2 22.1 16.7 29.2
35-38 Electronic, motorized vehicles, and precision instruments 9.0 17.3 30.3 30.0 14.0 96.2 22.9 20.4 59.8 23.7 16.8 37.0
39-43 Furniture, mixed freight and misc manufactured products 17.2 9.2 36.9 17.5 20.3 41.2 24.5 17.8 53.1 15.3 13.6 25.8
-- Commodity Unknown 32.0 42.0 15.4 S S S 40.8 S S 30.8 38.3 55.1

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.