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 8.3 6.6 14.9 10.4 7.9 17.2 11.0 2.4 16.7 9.4 5.0 12.7
01-05 Agriculture products and fish 21.3 14.5 31.1 S 15.0 S 34.9 18.5 62.6 20.4 25.3 74.7
06-09 Grains, alcohol, and tobacco products 28.2 11.6 62.8 26.5 8.9 39.4 19.8 20.8 46.3 28.6 40.6 45.7
10-14 Stones, non-metallic minerals, and metallic ores S 25.3 S 22.0 22.4 21.2 25.4 18.1 21.4 22.1 43.3 74.6
15-19 Coal and petroleum products 46.2 18.8 62.4 44.4 21.0 69.9 S 13.9 S S 16.0 S
20-24 Pharmaceutical and chemical products 9.0 7.7 16.9 20.0 10.2 31.5 17.4 11.1 34.7 12.3 11.8 23.3
25-30 Logs, wood products, and textile and leather 21.5 10.0 34.0 26.8 9.3 36.5 32.4 5.6 48.2 6.2 6.0 9.3
31-34 Base metal and machinery 11.0 6.5 12.7 29.9 17.0 55.2 13.6 15.2 29.4 15.2 11.2 24.8
35-38 Electronic, motorized vehicles, and precision instruments 14.3 10.8 26.4 13.7 10.0 28.3 12.5 9.9 27.9 15.7 7.7 26.3
39-43 Furniture, mixed freight and misc manufactured products 31.3 39.8 81.2 38.3 15.0 143.8 26.2 17.1 53.0 29.6 11.9 15.4
-- Commodity Unknown 47.4 27.1 15.9 44.1 S S S 34.6 S 24.3 22.3 27.4

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.