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 4.7 5.1 7.9 9.4 5.2 9.7 17.1 5.9 25.0 11.8 6.7 13.5
01-05 Agriculture products and fish 33.4 15.2 36.1 38.8 18.3 25.2 44.3 21.2 24.5 S 49.1 S
06-09 Grains, alcohol, and tobacco products 14.7 8.4 15.8 24.3 12.6 29.9 31.1 15.0 37.3 S 22.5 S
10-14 Stones, non-metallic minerals, and metallic ores 41.9 16.9 54.1 22.7 7.8 14.5 44.8 16.1 72.0 25.5 12.8 60.6
15-19 Coal and petroleum products 24.1 6.8 35.8 22.0 14.9 25.8 43.2 24.9 190.0 S 25.7 S
20-24 Pharmaceutical and chemical products 16.3 19.1 32.4 23.6 15.7 30.8 29.0 16.1 44.6 13.2 11.8 13.9
25-30 Logs, wood products, and textile and leather 14.5 6.8 17.5 17.8 11.6 22.4 41.8 14.0 65.1 14.6 14.7 20.6
31-34 Base metal and machinery 7.7 5.1 7.4 26.2 11.7 30.6 8.9 8.2 11.7 23.8 15.2 26.3
35-38 Electronic, motorized vehicles, and precision instruments 9.1 8.3 14.4 31.0 7.8 89.7 17.2 11.6 32.0 12.2 11.6 21.1
39-43 Furniture, mixed freight and misc manufactured products 8.6 15.8 26.3 22.7 19.5 49.4 20.5 12.1 31.3 13.0 5.7 10.4
-- Commodity Unknown 33.2 39.6 7.9 45.2 32.8 16.9 35.3 S S 29.3 20.1 22.6

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.