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 4.5 5.7 9.2 10.2 5.7 15.8 9.8 9.5 20.2 8.6 11.6 13.5
01-05 Agriculture products and fish 20.2 9.7 23.6 21.9 12.4 41.3 21.3 24.2 48.3 39.0 31.2 62.5
06-09 Grains, alcohol, and tobacco products 25.5 8.4 33.2 20.5 18.7 35.6 21.8 28.0 49.1 S 27.2 S
10-14 Stones, non-metallic minerals, and metallic ores 12.0 15.8 13.7 17.9 16.4 32.8 29.8 21.9 55.2 11.7 41.7 57.6
15-19 Coal and petroleum products 25.0 22.1 33.4 24.0 22.7 29.7 25.2 36.4 29.2 46.2 S S
20-24 Pharmaceutical and chemical products 7.9 5.3 13.0 36.8 10.9 53.9 47.9 16.4 62.6 17.8 10.1 19.4
25-30 Logs, wood products, and textile and leather 10.2 12.1 18.3 18.5 9.7 21.4 12.8 11.8 21.1 6.1 12.1 12.6
31-34 Base metal and machinery 9.4 4.9 13.9 12.0 15.0 16.7 22.6 13.7 37.8 27.4 13.0 36.7
35-38 Electronic, motorized vehicles, and precision instruments 20.5 17.4 24.4 48.9 15.2 75.6 43.1 21.5 50.5 8.6 6.5 14.4
39-43 Furniture, mixed freight and misc manufactured products 16.9 18.2 56.4 27.1 15.2 93.6 27.9 21.7 112.6 12.2 8.2 13.5
-- Commodity Unknown 38.6 45.1 14.8 29.5 44.1 20.0 40.2 39.0 49.2 24.4 20.4 36.2

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.