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 6.9 8.6 13.8 8.1 10.6 13.4 12.4 34.2 26.9 15.1 13.6 26.3
01-05 Agriculture products and fish 19.5 18.3 21.5 24.9 23.9 26.4 20.4 43.0 28.6 11.8 30.9 29.3
06-09 Grains, alcohol, and tobacco products 10.6 12.2 21.6 15.7 13.8 39.2 18.3 13.1 44.1 22.0 19.3 23.3
10-14 Stones, non-metallic minerals, and metallic ores 37.7 49.9 36.1 40.9 S S 41.4 S S S 42.4 S
15-19 Coal and petroleum products 13.7 20.6 30.5 14.3 20.7 27.2 19.5 25.1 25.1 16.5 22.0 19.9
20-24 Pharmaceutical and chemical products 16.3 19.9 42.2 44.1 30.7 77.4 36.0 33.5 88.8 21.3 34.9 230.1
25-30 Logs, wood products, and textile and leather 19.1 45.2 54.0 25.7 15.3 47.3 18.8 25.8 51.2 15.4 21.0 37.5
31-34 Base metal and machinery 19.4 7.9 50.9 28.2 40.2 58.0 27.1 13.0 89.0 S 26.3 S
35-38 Electronic, motorized vehicles, and precision instruments 20.6 21.4 51.1 22.4 36.9 67.4 34.3 S S 20.1 20.0 24.6
39-43 Furniture, mixed freight and misc manufactured products 12.5 18.7 20.0 24.2 44.1 26.4 S 21.2 S 26.2 28.5 38.4
-- Commodity Unknown S S S S S S 47.9 S S S S 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.