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 19.2 13.2 29.3 15.0 13.7 32.7 15.8 16.9 36.8 12.5 7.1 18.4
01-05 Agriculture products and fish 27.4 20.3 24.4 34.4 23.1 24.9 39.3 28.4 11.8 S 27.2 S
06-09 Grains, alcohol, and tobacco products 10.4 19.8 46.8 17.0 45.4 209.3 17.0 30.3 126.1 15.4 26.1 72.2
10-14 Stones, non-metallic minerals, and metallic ores 27.4 28.2 72.4 28.9 47.5 122.6 33.9 49.7 171.5 S S S
15-19 Coal and petroleum products 25.0 30.9 48.5 38.7 30.1 68.4 26.7 29.8 47.4 S 15.2 S
20-24 Pharmaceutical and chemical products 15.0 16.5 21.3 26.9 47.3 43.9 21.4 32.6 60.9 24.8 38.8 113.9
25-30 Logs, wood products, and textile and leather 8.6 17.4 15.4 18.9 23.6 23.9 29.0 28.5 28.5 9.5 15.4 37.9
31-34 Base metal and machinery 13.0 11.7 14.1 41.9 20.9 95.4 34.1 13.2 43.4 17.8 17.5 31.0
35-38 Electronic, motorized vehicles, and precision instruments 36.4 29.7 49.4 25.1 19.5 45.2 16.2 29.2 42.0 18.6 25.2 43.0
39-43 Furniture, mixed freight and misc manufactured products 26.8 10.6 82.0 28.3 S S 23.7 19.7 48.2 13.6 6.2 14.8
-- Commodity Unknown S S S S S S S S S 38.3 27.0 22.8

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.