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 14.5 7.5 22.8 14.2 48.2 43.4 38.1 16.9 78.2 10.0 11.4 20.4
01-05 Agriculture products and fish 27.1 50.0 76.2 45.9 S S 37.6 S S 37.6 25.3 264.5
06-09 Grains, alcohol, and tobacco products 23.3 34.1 39.9 38.6 36.2 122.5 S S S S 32.1 S
10-14 Stones, non-metallic minerals, and metallic ores 21.1 S S 18.1 S S 27.9 S S 21.3 31.8 82.9
15-19 Coal and petroleum products 25.7 19.7 65.2 24.3 20.1 72.5 30.3 29.0 100.4 36.0 20.3 48.2
20-24 Pharmaceutical and chemical products 15.3 21.6 31.6 36.9 28.0 70.3 27.8 30.1 54.4 18.0 35.9 53.3
25-30 Logs, wood products, and textile and leather 11.8 13.7 19.8 33.5 24.3 40.9 19.7 18.8 27.4 9.1 13.6 14.5
31-34 Base metal and machinery S 14.7 S 45.4 24.3 142.8 S S S 18.8 27.4 58.7
35-38 Electronic, motorized vehicles, and precision instruments 16.1 13.5 27.9 28.3 20.0 46.7 26.4 26.0 29.7 9.8 S S
39-43 Furniture, mixed freight and misc manufactured products 10.0 13.9 26.4 26.5 S S 16.0 30.3 55.1 6.0 11.5 12.3
-- Commodity Unknown S S S S S S 46.2 S S 21.8 44.9 150.6

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.