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 10.2 8.8 17.4 17.1 10.5 16.7 13.7 13.8 18.1 13.9 13.1 15.5
01-05 Agriculture products and fish 25.4 37.8 27.8 24.5 S S 42.2 S S S 30.7 S
06-09 Grains, alcohol, and tobacco products 11.1 13.4 16.5 18.0 22.8 26.5 24.7 15.3 34.3 S 26.6 S
10-14 Stones, non-metallic minerals, and metallic ores 34.6 18.7 30.0 S 27.5 S 45.0 28.8 48.7 S 25.8 S
15-19 Coal and petroleum products 10.8 26.1 33.0 22.0 9.6 32.5 17.6 13.6 27.0 38.7 11.5 23.8
20-24 Pharmaceutical and chemical products 25.7 18.5 34.5 29.9 23.0 23.6 36.6 49.4 41.3 18.5 21.6 56.0
25-30 Logs, wood products, and textile and leather 17.4 11.3 21.8 27.3 10.8 43.2 39.9 19.4 79.3 22.4 18.3 17.7
31-34 Base metal and machinery 13.2 7.4 16.5 14.4 17.2 12.1 11.9 26.3 17.8 19.1 12.8 21.6
35-38 Electronic, motorized vehicles, and precision instruments 17.4 18.9 25.8 30.1 34.3 48.5 22.0 S S 10.6 10.8 16.1
39-43 Furniture, mixed freight and misc manufactured products 34.2 18.1 152.1 S 12.9 S S 19.4 S 34.7 20.0 24.3
-- Commodity Unknown 42.0 20.1 18.1 26.0 S S 37.1 S S 49.5 27.9 26.1

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.