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 14.5 5.3 22.4 13.4 13.7 21.8 19.1 28.8 34.7 9.6 8.3 20.1
01-05 Agriculture products and fish S 20.1 S S 38.5 S S 45.8 S S 37.9 S
06-09 Grains, alcohol, and tobacco products 20.0 20.8 62.2 12.2 24.8 58.5 16.7 42.9 145.0 23.7 34.0 90.9
10-14 Stones, non-metallic minerals, and metallic ores 22.9 27.3 20.9 28.2 41.4 19.5 S 33.5 S 48.8 31.4 535.1
15-19 Coal and petroleum products 17.6 14.3 41.4 15.7 24.9 44.2 11.2 39.8 22.3 13.9 23.0 29.7
20-24 Pharmaceutical and chemical products 15.1 8.8 22.3 42.8 18.8 100.6 36.1 27.7 79.5 21.2 16.5 18.9
25-30 Logs, wood products, and textile and leather 22.7 8.1 34.5 19.4 17.2 27.6 44.1 11.4 122.3 11.8 5.8 17.1
31-34 Base metal and machinery 12.3 7.7 17.4 25.0 10.8 30.3 40.8 9.1 159.4 18.7 11.1 43.2
35-38 Electronic, motorized vehicles, and precision instruments S 20.0 S S 22.8 S 37.2 26.7 81.7 11.6 12.4 32.9
39-43 Furniture, mixed freight and misc manufactured products 9.4 8.3 28.3 15.8 S S 21.3 S S 13.4 11.4 17.8
-- Commodity Unknown S S S S 42.9 S S S S 17.8 28.2 45.7

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.