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 20.9 19.7 37.9 8.9 21.0 32.4 23.7 46.5 53.8 20.5 17.4 31.8
01-05 Agriculture products and fish 14.0 20.3 31.1 14.1 40.7 80.9 34.1 S S 26.8 19.1 11.8
06-09 Grains, alcohol, and tobacco products 11.8 27.0 25.2 18.4 35.9 31.2 34.4 31.5 43.9 34.5 S S
10-14 Stones, non-metallic minerals, and metallic ores 23.1 18.5 11.6 37.0 49.8 48.5 19.1 17.9 5.9 S S S
15-19 Coal and petroleum products 9.4 44.7 63.6 14.6 S S 14.6 S S 21.8 S S
20-24 Pharmaceutical and chemical products 14.2 13.9 32.2 33.2 S S 23.9 21.0 66.2 23.3 18.6 12.9
25-30 Logs, wood products, and textile and leather 9.2 15.4 17.9 13.6 20.7 29.1 18.1 26.5 37.9 19.1 27.2 68.5
31-34 Base metal and machinery 44.7 14.4 83.4 46.0 23.4 77.6 31.2 18.7 38.7 33.5 15.4 50.8
35-38 Electronic, motorized vehicles, and precision instruments S 46.1 S 30.9 25.0 58.0 38.2 36.8 63.0 20.7 16.9 31.7
39-43 Furniture, mixed freight and misc manufactured products 26.1 14.2 68.5 S 40.7 S S 49.5 S 16.7 15.8 38.1
-- Commodity Unknown 49.7 S S S S S S S S 49.7 23.6 21.9

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.