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 8.7 5.9 13.3 15.0 11.1 22.2 18.0 20.0 34.7 5.7 13.6 17.6
01-05 Agriculture products and fish 23.1 11.1 23.2 20.9 20.7 22.9 18.3 21.5 24.8 30.3 14.0 65.6
06-09 Grains, alcohol, and tobacco products 23.6 12.9 30.3 32.2 16.6 25.2 45.3 35.5 24.4 17.7 S S
10-14 Stones, non-metallic minerals, and metallic ores 34.4 28.2 33.7 22.2 17.1 32.7 34.2 14.4 52.0 S 10.9 S
15-19 Coal and petroleum products 16.6 22.6 41.0 11.1 21.3 28.3 17.4 25.0 47.4 30.2 S S
20-24 Pharmaceutical and chemical products 17.7 17.2 28.0 49.4 24.5 113.6 25.8 11.7 34.9 25.5 13.3 21.4
25-30 Logs, wood products, and textile and leather 15.9 11.1 20.7 S 11.7 S S 15.2 S 12.0 7.7 12.4
31-34 Base metal and machinery 13.5 9.7 18.9 36.7 21.2 61.5 28.1 10.1 32.5 12.7 16.4 36.3
35-38 Electronic, motorized vehicles, and precision instruments 17.4 12.2 26.4 S 26.8 S S 20.2 S 8.5 11.4 10.9
39-43 Furniture, mixed freight and misc manufactured products 16.2 20.4 48.4 27.8 25.7 52.8 15.3 21.3 34.3 10.5 11.1 16.8
-- Commodity Unknown 37.3 42.8 31.2 49.6 41.8 340.8 S S S 39.2 27.1 31.7

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.