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 18.9 5.2 28.4 11.5 9.0 12.2 28.1 21.0 37.9 8.9 8.3 14.5
01-05 Agriculture products and fish 18.1 15.3 27.4 31.1 37.8 30.2 31.7 25.5 35.6 22.3 33.3 54.3
06-09 Grains, alcohol, and tobacco products 11.1 12.3 14.7 14.6 18.0 17.0 31.2 15.3 38.0 33.9 26.8 113.3
10-14 Stones, non-metallic minerals, and metallic ores 41.2 23.1 43.9 11.5 18.8 15.8 39.9 20.6 55.8 22.3 37.8 26.7
15-19 Coal and petroleum products 35.3 21.1 59.6 47.8 11.6 46.8 42.8 44.9 28.3 S 27.5 S
20-24 Pharmaceutical and chemical products 19.2 20.3 31.2 21.1 12.4 36.7 22.7 12.4 38.7 22.1 22.7 28.7
25-30 Logs, wood products, and textile and leather 27.4 10.0 53.0 32.8 8.4 52.9 S 12.6 S 11.9 19.3 30.8
31-34 Base metal and machinery 13.8 8.8 16.7 35.2 21.8 13.8 21.0 S S 10.5 20.5 45.2
35-38 Electronic, motorized vehicles, and precision instruments 48.5 11.5 77.5 16.8 22.8 17.7 31.9 15.6 31.9 17.0 18.3 31.4
39-43 Furniture, mixed freight and misc manufactured products 8.6 9.5 26.4 18.1 27.0 83.4 20.0 15.3 49.9 12.5 8.7 13.5
-- Commodity Unknown S 37.0 S S 48.7 S 39.5 46.0 8.2 34.3 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.