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 9.5 10.3 18.5 15.2 19.3 35.9 21.5 22.1 47.0 20.3 S S
01-05 Agriculture products and fish 43.2 34.9 114.7 48.7 S S 48.0 43.2 50.6 S S S
06-09 Grains, alcohol, and tobacco products 19.4 31.1 40.4 19.2 37.2 40.3 25.7 25.5 19.0 S S S
10-14 Stones, non-metallic minerals, and metallic ores 40.5 28.5 41.4 39.6 22.1 60.1 46.3 22.1 61.1 40.0 43.2 52.8
15-19 Coal and petroleum products 11.5 7.9 22.4 16.4 21.1 39.9 22.4 24.0 52.0 28.9 23.0 28.8
20-24 Pharmaceutical and chemical products 25.9 23.5 33.1 32.2 17.3 33.7 33.7 16.0 21.1 30.3 S S
25-30 Logs, wood products, and textile and leather 27.5 S S 48.4 34.2 67.5 48.0 21.0 70.3 20.7 S S
31-34 Base metal and machinery 19.5 30.7 57.8 29.7 37.8 95.9 12.7 30.4 23.1 43.6 47.5 82.6
35-38 Electronic, motorized vehicles, and precision instruments S 47.6 S 18.9 45.3 248.4 34.1 S S 23.3 30.4 68.8
39-43 Furniture, mixed freight and misc manufactured products 15.9 37.1 55.9 S 41.9 S S 35.5 S 17.8 35.7 56.9
-- Commodity Unknown 38.1 S S S S S S S S 46.5 30.0 22.1

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.