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 15.1 8.5 17.3 16.3 5.8 19.3 15.9 4.2 20.7 12.0 9.1 28.9
01-05 Agriculture products and fish 15.1 15.3 15.1 17.2 25.8 10.1 25.8 23.4 18.7 22.2 25.8 97.1
06-09 Grains, alcohol, and tobacco products 9.6 16.9 16.9 15.7 16.9 23.9 17.4 18.8 27.2 S 25.6 S
10-14 Stones, non-metallic minerals, and metallic ores 35.9 38.8 32.9 40.0 27.5 106.6 46.6 S S S 41.3 S
15-19 Coal and petroleum products 21.5 19.1 41.8 22.6 22.4 61.9 15.8 41.6 68.5 S 35.5 S
20-24 Pharmaceutical and chemical products 26.0 11.0 26.8 39.5 42.1 44.9 32.6 14.9 73.4 23.5 17.0 72.9
25-30 Logs, wood products, and textile and leather 22.7 14.7 26.3 14.2 15.2 18.1 23.6 8.3 39.4 16.3 7.1 23.0
31-34 Base metal and machinery 12.3 7.1 10.1 33.0 20.5 48.6 16.6 13.3 17.6 18.5 12.7 28.2
35-38 Electronic, motorized vehicles, and precision instruments 34.6 13.1 46.0 19.3 13.5 21.9 20.6 29.2 24.0 11.9 11.9 32.2
39-43 Furniture, mixed freight and misc manufactured products 8.7 S S 12.7 S S 13.3 39.3 46.0 7.7 12.7 16.4
-- Commodity Unknown S 32.0 S 44.7 29.3 5.9 S 44.2 S S 27.8 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.