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 3.4 7.3 8.2 8.0 10.1 13.3 24.7 14.3 26.3 32.0 12.7 31.3
01-05 Agriculture products and fish 22.6 18.0 20.0 26.5 20.6 29.1 43.1 27.4 51.5 S S S
06-09 Grains, alcohol, and tobacco products 12.0 13.6 14.9 11.9 15.9 16.4 12.4 20.2 16.9 23.4 15.7 35.3
10-14 Stones, non-metallic minerals, and metallic ores 36.8 20.2 30.5 44.3 23.4 134.2 S 18.1 S S S S
15-19 Coal and petroleum products 9.8 16.6 20.1 7.4 13.6 15.7 26.0 17.6 24.4 25.6 27.9 23.0
20-24 Pharmaceutical and chemical products 16.3 25.3 20.0 28.5 30.8 24.3 42.5 42.2 34.3 28.0 20.7 31.8
25-30 Logs, wood products, and textile and leather 11.4 10.3 16.8 18.2 7.1 22.7 22.0 7.8 26.1 10.6 17.6 30.2
31-34 Base metal and machinery 13.2 14.3 14.2 26.0 26.9 24.3 33.3 13.5 25.9 S 22.9 S
35-38 Electronic, motorized vehicles, and precision instruments 11.9 17.0 25.8 24.7 20.7 48.8 13.1 20.5 22.9 S 26.6 S
39-43 Furniture, mixed freight and misc manufactured products 9.4 10.2 28.1 26.8 S S 36.7 S S 12.0 15.9 17.1
-- Commodity Unknown S 25.1 S 27.8 S S S 43.3 S 35.9 21.1 57.6

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.