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 8.7 17.1 23.1 22.1 33.4 51.4 10.0 10.1 14.1 17.6 26.7 76.3
01-05 Agriculture products and fish 21.1 23.0 34.0 22.7 22.9 27.7 17.8 18.2 33.6 26.0 40.4 112.2
06-09 Grains, alcohol, and tobacco products 8.4 25.5 27.9 20.6 22.9 44.3 33.0 23.9 91.4 27.7 S S
10-14 Stones, non-metallic minerals, and metallic ores 42.3 S S 43.2 49.8 103.0 32.3 44.1 35.3 17.4 S S
15-19 Coal and petroleum products 33.1 S S 30.5 S S 29.5 S S 28.3 31.3 7.2
20-24 Pharmaceutical and chemical products 22.1 45.2 65.3 24.1 34.7 35.5 26.2 17.1 27.2 25.1 16.7 24.2
25-30 Logs, wood products, and textile and leather 26.9 24.9 24.8 25.4 23.1 25.1 S 26.0 S 15.9 17.7 43.3
31-34 Base metal and machinery 10.9 27.1 29.9 S S S 30.6 39.3 70.1 20.9 32.9 34.3
35-38 Electronic, motorized vehicles, and precision instruments 26.1 38.9 57.1 17.7 36.0 52.6 37.1 S S 17.2 S S
39-43 Furniture, mixed freight and misc manufactured products 28.1 42.1 109.4 21.2 38.7 40.6 26.5 41.7 32.5 16.7 21.9 17.3
-- Commodity Unknown 44.7 S S 37.1 S S S S S S 42.7 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.