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 13.3 6.5 23.4 10.4 10.5 12.8 16.3 14.2 29.7 14.8 8.1 29.0
01-05 Agriculture products and fish 22.9 23.3 50.8 27.7 25.4 57.5 28.8 25.0 81.8 15.3 S S
06-09 Grains, alcohol, and tobacco products 24.0 12.2 27.7 24.7 13.8 26.6 29.8 25.5 29.9 22.3 20.9 22.5
10-14 Stones, non-metallic minerals, and metallic ores 17.9 37.0 20.6 32.4 19.6 24.4 19.8 22.8 36.0 S 28.9 S
15-19 Coal and petroleum products 16.9 23.5 41.0 19.9 25.2 37.3 40.1 35.4 192.8 S 15.5 S
20-24 Pharmaceutical and chemical products 10.7 8.6 20.3 18.3 10.9 39.1 14.1 35.5 40.0 S 16.8 S
25-30 Logs, wood products, and textile and leather 34.4 20.2 78.3 12.6 21.7 20.4 16.8 23.9 23.5 15.2 9.3 25.6
31-34 Base metal and machinery 15.5 6.7 18.7 23.4 38.7 7.9 33.2 8.6 31.1 19.8 10.7 32.2
35-38 Electronic, motorized vehicles, and precision instruments 43.9 8.5 90.5 43.1 12.2 38.1 11.3 11.3 10.6 21.7 24.6 78.2
39-43 Furniture, mixed freight and misc manufactured products 19.3 22.4 48.5 17.2 10.6 26.8 15.3 9.5 21.7 22.1 14.1 25.5
-- Commodity Unknown 39.7 S S 47.2 44.8 8.6 S 33.1 S 35.2 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.