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 8.0 4.2 9.9 10.4 11.8 18.8 16.9 8.5 21.1 12.4 23.0 44.5
01-05 Agriculture products and fish 17.3 30.1 21.2 22.6 34.2 29.8 22.9 29.9 34.2 34.6 S S
06-09 Grains, alcohol, and tobacco products 8.7 14.9 27.9 21.7 38.0 115.6 47.0 34.1 439.9 34.9 47.6 48.8
10-14 Stones, non-metallic minerals, and metallic ores S 27.7 S 21.1 35.3 139.3 27.2 24.9 232.0 29.8 S S
15-19 Coal and petroleum products 9.9 11.9 18.4 14.4 12.1 19.8 20.0 9.6 24.3 S 26.5 S
20-24 Pharmaceutical and chemical products 33.6 15.3 39.9 S 23.1 S 40.9 24.8 36.3 32.1 35.3 86.8
25-30 Logs, wood products, and textile and leather 15.6 24.3 46.0 31.7 27.3 49.5 22.4 18.9 54.1 24.4 21.0 16.2
31-34 Base metal and machinery 13.3 14.5 20.6 18.0 22.9 24.3 34.0 19.8 55.5 14.6 16.1 35.2
35-38 Electronic, motorized vehicles, and precision instruments 21.0 26.9 20.7 18.5 36.4 15.4 32.8 36.8 17.6 15.8 20.1 38.1
39-43 Furniture, mixed freight and misc manufactured products 13.2 22.9 42.6 S 22.0 S 26.6 17.6 92.7 17.3 34.5 145.9
-- Commodity Unknown 48.7 37.6 69.9 S S S S S S S 49.4 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.