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 13.4 10.9 24.0 25.3 10.6 36.6 10.5 7.7 19.3 19.8 15.9 26.7
01-05 Agriculture products and fish S 17.2 S S 17.6 S S 43.1 S S 30.1 S
06-09 Grains, alcohol, and tobacco products 12.3 7.2 14.3 13.9 9.3 16.0 23.4 15.3 36.7 24.8 16.2 47.1
10-14 Stones, non-metallic minerals, and metallic ores 48.2 20.8 89.3 S 25.6 S 30.5 25.8 63.7 21.5 S S
15-19 Coal and petroleum products 26.1 15.5 7.6 37.1 23.5 21.8 40.4 25.0 18.4 33.0 13.9 40.0
20-24 Pharmaceutical and chemical products 22.8 12.1 38.9 32.2 13.8 60.8 20.9 18.0 39.2 32.9 10.5 35.9
25-30 Logs, wood products, and textile and leather 42.9 11.8 122.9 42.5 16.0 85.7 14.7 10.5 25.1 18.3 12.9 13.9
31-34 Base metal and machinery 12.6 11.1 21.4 26.1 15.1 24.7 34.0 14.3 83.5 26.1 17.5 23.8
35-38 Electronic, motorized vehicles, and precision instruments 16.2 18.1 20.0 12.4 29.4 22.9 20.3 40.8 20.5 17.1 33.8 87.7
39-43 Furniture, mixed freight and misc manufactured products 20.8 34.4 40.9 42.0 36.8 47.5 S 18.9 S 25.8 24.8 37.2
-- Commodity Unknown 35.6 S S 31.4 47.9 25.7 47.8 S S 30.4 42.3 296.9

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.