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 5.8 7.1 13.5 14.0 13.0 27.2 11.7 14.5 24.8 16.6 11.2 16.7
01-05 Agriculture products and fish 28.3 28.7 67.3 S 36.6 S S S S 18.3 19.2 32.9
06-09 Grains, alcohol, and tobacco products 25.4 14.8 45.1 S 19.0 S S 33.5 S 12.2 21.8 21.1
10-14 Stones, non-metallic minerals, and metallic ores 43.3 43.1 566.4 43.2 42.5 70.4 36.4 43.0 370.6 S 19.8 S
15-19 Coal and petroleum products 19.0 16.7 43.9 20.3 31.0 50.0 24.1 43.4 56.8 9.3 28.4 44.5
20-24 Pharmaceutical and chemical products 20.1 20.4 18.4 48.8 43.3 79.7 29.3 13.7 39.6 44.9 8.8 81.1
25-30 Logs, wood products, and textile and leather 9.6 11.4 14.3 22.1 13.4 33.7 15.8 17.5 29.0 9.4 5.9 11.3
31-34 Base metal and machinery 19.8 17.8 34.9 S 16.3 S 15.3 44.7 46.7 49.2 22.0 57.3
35-38 Electronic, motorized vehicles, and precision instruments 15.3 11.6 21.3 27.0 20.7 34.2 33.1 25.4 54.4 S 32.3 S
39-43 Furniture, mixed freight and misc manufactured products 19.0 10.2 113.9 15.0 29.4 52.8 22.3 30.1 40.9 17.5 15.7 18.3
-- Commodity Unknown S 36.0 S S S S S S S 39.4 22.4 2.4

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.