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 5.2 3.8 7.9 9.1 12.7 15.4 14.0 5.4 22.8 9.5 4.7 12.6
01-05 Agriculture products and fish 16.0 8.4 21.3 33.7 12.9 82.1 S 21.9 S 35.2 25.4 26.6
06-09 Grains, alcohol, and tobacco products 10.0 3.4 13.1 17.6 7.5 23.9 23.3 10.8 28.8 30.3 24.1 28.5
10-14 Stones, non-metallic minerals, and metallic ores 25.4 16.8 30.8 11.5 27.8 22.4 30.9 26.3 125.4 37.4 22.2 96.1
15-19 Coal and petroleum products 24.6 36.2 17.5 24.9 35.1 16.5 27.7 32.4 82.7 35.6 16.9 127.0
20-24 Pharmaceutical and chemical products 12.2 8.3 16.0 30.2 11.1 68.6 24.6 11.5 65.4 11.5 13.9 12.4
25-30 Logs, wood products, and textile and leather 8.1 6.2 12.6 10.9 11.6 13.1 10.0 14.6 12.5 6.5 4.8 9.4
31-34 Base metal and machinery 9.5 4.2 9.6 49.9 11.9 44.7 10.8 15.7 16.2 18.5 11.0 16.1
35-38 Electronic, motorized vehicles, and precision instruments 24.2 11.1 30.5 39.5 13.1 69.8 20.7 15.7 33.5 15.0 15.3 21.7
39-43 Furniture, mixed freight and misc manufactured products 5.8 6.4 20.7 15.1 10.7 27.9 10.8 15.1 21.5 7.5 7.7 10.9
-- Commodity Unknown 41.6 35.2 49.4 46.6 S S 48.3 39.4 21.9 35.6 22.9 20.0

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.