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 9.2 5.8 13.4 14.7 10.6 19.5 S 18.3 S 46.8 20.3 65.6
01-05 Agriculture products and fish 35.5 14.0 29.6 S 25.4 S S S S 47.0 S S
06-09 Grains, alcohol, and tobacco products 13.5 11.1 14.8 19.1 15.9 19.8 34.3 36.6 45.9 S 35.5 S
10-14 Stones, non-metallic minerals, and metallic ores 13.5 24.2 29.6 12.6 26.0 27.8 38.5 26.2 256.8 S 34.2 S
15-19 Coal and petroleum products 28.1 18.9 34.2 23.1 17.3 28.5 35.4 35.8 77.4 S 25.5 S
20-24 Pharmaceutical and chemical products 20.1 12.2 35.7 19.6 15.6 32.3 39.1 28.8 52.8 36.8 S S
25-30 Logs, wood products, and textile and leather 12.5 9.8 17.6 19.2 17.2 19.3 27.4 14.5 59.1 29.3 38.1 360.2
31-34 Base metal and machinery 12.1 13.8 21.8 7.3 20.0 27.8 40.4 32.0 191.4 34.3 22.6 147.2
35-38 Electronic, motorized vehicles, and precision instruments 39.9 16.2 76.1 45.9 26.3 107.7 S 25.9 S 26.5 31.7 25.4
39-43 Furniture, mixed freight and misc manufactured products 34.3 8.0 110.4 47.5 28.4 316.2 S S S 30.6 37.4 41.1
-- Commodity Unknown S 43.9 S S S S 44.5 S S S 35.0 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.