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 6.1 8.3 10.5 21.2 24.3 31.5 15.7 23.7 25.0 4.5 10.6 15.6
01-05 Agriculture products and fish 29.9 S S 29.9 S S 31.7 43.5 85.6 S S S
06-09 Grains, alcohol, and tobacco products 11.8 32.3 36.9 12.0 34.8 32.5 40.6 42.9 74.6 32.9 42.5 45.4
10-14 Stones, non-metallic minerals, and metallic ores S 35.9 S S S S 49.9 39.2 43.8 18.7 37.8 17.0
15-19 Coal and petroleum products 26.5 42.0 177.1 30.7 39.4 140.4 S 46.3 S 30.2 36.8 985.1
20-24 Pharmaceutical and chemical products 13.2 19.9 29.6 18.8 46.0 2.0 11.8 S S 21.3 S S
25-30 Logs, wood products, and textile and leather 8.7 14.4 20.2 23.7 17.6 58.1 17.1 17.5 26.4 6.8 9.9 13.7
31-34 Base metal and machinery 11.2 16.9 17.6 43.4 48.2 98.7 38.3 41.3 67.5 17.6 23.6 37.3
35-38 Electronic, motorized vehicles, and precision instruments 14.4 16.8 15.2 31.2 11.4 74.3 S 19.7 S 6.6 18.6 30.5
39-43 Furniture, mixed freight and misc manufactured products 21.4 12.4 62.1 27.9 30.1 67.9 23.0 36.7 61.4 13.9 12.7 16.8
-- Commodity Unknown S S S S S S S S S S 27.6 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.