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 9.9 16.8 22.0 10.6 12.5 13.7 13.9 8.3 23.6 15.9 19.3 18.3
01-05 Agriculture products and fish 32.3 17.2 56.2 31.3 13.7 54.5 30.1 26.8 78.1 37.3 S S
06-09 Grains, alcohol, and tobacco products 15.0 12.6 27.0 25.2 9.3 38.6 31.3 11.1 48.0 S 32.9 S
10-14 Stones, non-metallic minerals, and metallic ores 26.2 25.0 18.3 S 39.0 S 33.3 20.6 28.8 S S S
15-19 Coal and petroleum products 15.8 40.9 73.6 15.3 36.9 60.4 43.8 31.6 173.2 31.3 S S
20-24 Pharmaceutical and chemical products 23.3 13.0 16.3 29.0 20.8 19.9 21.8 21.5 20.6 25.5 14.2 101.7
25-30 Logs, wood products, and textile and leather 31.9 14.7 45.1 16.9 8.5 28.1 19.4 9.4 27.9 17.5 14.6 13.2
31-34 Base metal and machinery 12.4 15.2 14.1 40.1 19.3 7.8 S 22.3 S 33.4 24.5 29.5
35-38 Electronic, motorized vehicles, and precision instruments 26.0 S S 31.4 21.2 30.2 27.6 49.2 48.9 16.5 24.6 42.8
39-43 Furniture, mixed freight and misc manufactured products 14.4 21.2 43.0 37.4 26.3 117.9 32.9 35.9 133.6 31.9 17.9 14.8
-- Commodity Unknown 45.4 47.3 8.4 S S S S S S S 32.3 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.