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 13.6 14.6 19.5 8.2 11.8 15.3 12.8 12.6 21.5 7.4 10.0 12.0
01-05 Agriculture products and fish 34.9 17.6 46.6 29.4 27.0 88.6 43.4 30.2 146.3 S S S
06-09 Grains, alcohol, and tobacco products 10.2 11.1 18.0 19.5 16.2 27.8 22.7 7.8 33.7 S 22.3 S
10-14 Stones, non-metallic minerals, and metallic ores S 16.2 S 19.5 27.9 25.3 45.1 35.1 84.7 24.7 19.6 22.0
15-19 Coal and petroleum products 14.8 21.0 42.0 20.9 21.8 38.9 20.3 S S S S S
20-24 Pharmaceutical and chemical products 42.3 10.3 59.1 20.5 14.3 28.3 35.7 20.3 85.6 7.0 11.2 14.1
25-30 Logs, wood products, and textile and leather 16.3 S S 20.9 21.5 18.2 27.0 21.6 20.3 13.5 12.9 19.1
31-34 Base metal and machinery 13.4 20.7 14.1 42.6 24.4 59.3 21.8 14.8 20.5 11.4 12.1 16.8
35-38 Electronic, motorized vehicles, and precision instruments 12.2 8.3 14.0 15.4 9.7 15.2 16.6 15.4 16.7 13.9 10.0 17.5
39-43 Furniture, mixed freight and misc manufactured products 9.2 13.7 30.1 16.1 21.8 48.0 22.0 24.9 40.8 12.4 14.7 21.9
-- Commodity Unknown 46.1 S S S 49.4 S 45.1 S S S 31.7 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.