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 7.3 6.7 10.5 9.6 8.1 10.6 19.6 14.8 17.2 8.2 14.7 9.7
01-05 Agriculture products and fish 15.0 10.4 18.5 20.9 12.4 21.3 24.9 20.7 19.3 28.7 23.3 39.7
06-09 Grains, alcohol, and tobacco products 17.6 7.1 12.5 37.1 14.3 42.2 S 18.0 S 30.8 18.4 70.3
10-14 Stones, non-metallic minerals, and metallic ores 16.2 26.0 20.7 23.8 22.4 31.1 29.3 31.5 34.4 S 30.9 S
15-19 Coal and petroleum products 38.1 21.2 39.0 48.6 22.2 42.0 49.6 49.8 39.7 39.5 33.1 85.3
20-24 Pharmaceutical and chemical products 18.8 17.2 47.0 28.1 42.5 73.9 36.0 19.5 62.9 13.6 19.7 11.3
25-30 Logs, wood products, and textile and leather 26.6 35.9 26.9 22.9 31.2 33.7 44.7 31.4 114.5 18.3 13.6 16.9
31-34 Base metal and machinery 12.1 15.6 23.7 24.5 48.1 20.4 24.4 S S 23.3 17.0 11.5
35-38 Electronic, motorized vehicles, and precision instruments 11.2 11.1 21.0 13.2 8.5 21.7 21.6 6.8 28.4 13.3 13.1 14.1
39-43 Furniture, mixed freight and misc manufactured products 14.2 13.5 16.1 S 17.9 S S 19.7 S 12.4 15.0 14.7
-- Commodity Unknown S 33.1 S S S S S 46.8 S S 28.3 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.