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 6.9 6.2 13.2 11.8 6.3 16.6 9.4 4.2 11.4 9.9 2.9 9.7
01-05 Agriculture products and fish 15.6 10.5 19.8 22.0 17.3 19.1 37.2 44.3 42.8 18.4 21.5 37.4
06-09 Grains, alcohol, and tobacco products 8.3 3.4 12.3 9.7 5.5 11.8 23.6 12.1 39.2 S 30.1 S
10-14 Stones, non-metallic minerals, and metallic ores 14.6 17.5 18.3 15.7 15.8 26.0 20.0 23.3 20.7 33.8 15.9 29.1
15-19 Coal and petroleum products 13.3 10.8 21.8 13.4 10.3 17.6 14.1 24.3 19.5 24.6 12.6 16.7
20-24 Pharmaceutical and chemical products 9.2 5.1 15.7 S 13.1 S 15.2 5.9 17.2 8.3 5.6 8.9
25-30 Logs, wood products, and textile and leather 9.9 6.5 15.4 S 34.0 S 15.8 20.1 44.3 11.0 7.6 20.1
31-34 Base metal and machinery 10.9 8.7 13.5 24.9 11.4 25.7 16.9 12.7 21.1 21.8 12.7 31.3
35-38 Electronic, motorized vehicles, and precision instruments 17.6 8.0 33.5 26.1 11.4 80.4 14.2 6.2 55.1 15.7 9.5 18.6
39-43 Furniture, mixed freight and misc manufactured products 8.4 30.0 47.7 18.4 20.8 34.0 31.1 20.4 49.2 13.0 9.9 8.4
-- Commodity Unknown 21.7 30.5 15.9 49.4 35.9 74.5 32.5 28.2 21.3 S 32.0 S

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.