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 9.0 6.0 10.0 12.2 10.2 12.6 16.9 13.7 14.6 13.0 13.8 6.5
01-05 Agriculture products and fish 42.4 37.1 24.7 S 29.1 S S S S S S S
06-09 Grains, alcohol, and tobacco products 15.4 20.2 38.6 27.1 25.5 67.0 16.9 41.8 82.5 27.7 43.6 39.3
10-14 Stones, non-metallic minerals, and metallic ores 17.8 43.9 21.5 25.7 47.0 56.6 37.1 S S 49.2 27.4 49.1
15-19 Coal and petroleum products 26.8 16.4 33.7 17.9 17.7 20.8 29.4 12.8 17.2 39.3 15.6 17.6
20-24 Pharmaceutical and chemical products 20.8 23.4 13.3 30.5 28.0 14.0 34.7 36.2 25.2 32.7 19.7 8.6
25-30 Logs, wood products, and textile and leather 21.1 9.9 22.8 15.5 26.0 15.6 26.1 35.4 18.3 18.4 19.1 10.1
31-34 Base metal and machinery 19.1 7.2 18.8 33.0 15.4 24.1 24.7 19.1 33.7 25.8 23.1 50.8
35-38 Electronic, motorized vehicles, and precision instruments 16.8 24.3 21.1 45.3 15.5 77.9 39.6 24.5 89.8 37.8 20.2 39.5
39-43 Furniture, mixed freight and misc manufactured products 21.7 20.6 55.4 33.1 27.9 249.7 42.6 38.0 200.8 19.5 15.9 23.7
-- Commodity Unknown 37.6 31.7 30.9 S 35.3 S S S S 36.8 36.5 40.2

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.