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 3.9 4.8 7.2 6.5 6.2 11.3 17.8 10.9 23.8 11.8 17.0 21.7
01-05 Agriculture products and fish 21.0 20.6 43.5 22.2 23.8 74.9 31.3 14.9 82.7 S S S
06-09 Grains, alcohol, and tobacco products 7.6 11.1 11.9 16.5 19.8 24.0 30.3 25.9 48.7 37.2 42.8 41.7
10-14 Stones, non-metallic minerals, and metallic ores 34.7 25.8 40.0 35.2 32.9 44.4 33.4 S S 45.6 39.8 94.2
15-19 Coal and petroleum products 8.6 5.5 14.0 8.7 8.9 16.7 9.3 21.4 34.6 S S S
20-24 Pharmaceutical and chemical products 13.2 7.2 17.0 21.7 12.6 24.8 40.8 9.5 53.3 18.4 13.1 39.6
25-30 Logs, wood products, and textile and leather 14.3 20.3 18.7 12.1 38.0 19.9 6.5 37.7 23.0 32.9 10.9 11.5
31-34 Base metal and machinery 7.8 8.0 11.6 S 42.1 S 13.2 34.2 22.8 19.8 22.4 23.7
35-38 Electronic, motorized vehicles, and precision instruments 31.0 24.1 44.2 35.6 17.6 56.2 S 32.4 S 47.2 28.9 67.6
39-43 Furniture, mixed freight and misc manufactured products 12.8 14.6 34.9 24.8 24.2 35.0 41.8 17.7 45.0 21.8 23.9 35.0
-- Commodity Unknown 14.5 46.1 15.6 23.4 S S S S S S 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.