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 11.2 5.7 24.4 20.3 12.0 42.7 21.9 19.1 49.3 7.3 13.3 12.5
01-05 Agriculture products and fish 26.4 34.6 53.3 37.6 25.3 71.1 S S S S 21.4 S
06-09 Grains, alcohol, and tobacco products 10.8 15.8 27.2 11.6 16.6 24.5 25.0 17.1 41.1 40.3 22.5 105.2
10-14 Stones, non-metallic minerals, and metallic ores 24.7 33.3 19.2 30.8 23.7 156.0 21.2 23.4 64.5 S S S
15-19 Coal and petroleum products S 13.2 S S 15.7 S S 16.9 S S 22.3 S
20-24 Pharmaceutical and chemical products 28.7 24.7 125.3 19.6 31.5 108.4 18.8 39.5 76.1 14.7 15.4 9.7
25-30 Logs, wood products, and textile and leather 23.7 19.0 80.4 S 21.6 S S 24.8 S 10.8 10.3 15.1
31-34 Base metal and machinery 13.8 7.3 24.9 26.4 18.9 34.4 46.5 42.0 83.1 19.0 18.0 37.8
35-38 Electronic, motorized vehicles, and precision instruments 22.0 11.2 73.2 12.1 14.2 31.2 20.3 18.5 75.9 12.3 27.9 59.3
39-43 Furniture, mixed freight and misc manufactured products 24.4 14.7 37.7 34.5 27.7 80.1 S 33.7 S 28.5 14.4 18.2
-- Commodity Unknown 20.8 S S 46.7 S S S 48.3 S 27.0 28.3 71.7

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.