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 11.9 7.3 17.5 34.5 14.3 73.6 23.4 40.0 51.9 22.9 14.2 23.3
01-05 Agriculture products and fish 20.6 25.2 27.3 31.8 32.4 53.0 39.0 37.2 74.9 31.4 32.4 87.9
06-09 Grains, alcohol, and tobacco products 20.4 13.4 32.7 28.7 19.9 62.1 19.7 23.8 135.1 26.6 16.4 53.2
10-14 Stones, non-metallic minerals, and metallic ores S S S S S S S S S S S S
15-19 Coal and petroleum products 20.6 12.7 31.5 20.5 12.6 35.3 22.9 S S S 18.1 S
20-24 Pharmaceutical and chemical products 47.0 31.3 56.5 S S S S S S 34.8 35.0 43.0
25-30 Logs, wood products, and textile and leather 14.4 20.1 16.0 S 45.2 S S 44.2 S 44.2 20.6 21.7
31-34 Base metal and machinery 19.7 17.3 32.6 38.8 S S 27.4 16.6 53.8 26.0 16.8 26.5
35-38 Electronic, motorized vehicles, and precision instruments 9.6 14.2 27.6 19.5 16.4 53.6 22.6 20.9 75.8 27.6 14.3 25.8
39-43 Furniture, mixed freight and misc manufactured products S 37.2 S S 30.6 S 44.5 S S 29.3 18.6 15.7
-- Commodity Unknown 39.0 48.3 387.6 44.9 43.2 S S S S S S 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.