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]

Excel | CSV

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 5.9 4.3 7.7 13.6 3.9 15.0 39.2 8.9 76.1 15.7 16.5 28.1
01-05 Agriculture products and fish 25.6 11.2 21.3 29.8 9.5 34.8 S 17.0 S 22.8 24.4 85.5
06-09 Grains, alcohol, and tobacco products 25.6 15.5 29.5 29.9 6.7 37.1 25.6 11.6 29.2 21.4 7.9 92.7
10-14 Stones, non-metallic minerals, and metallic ores 27.6 S S 26.2 20.9 34.5 S 40.2 S 20.5 38.6 47.7
15-19 Coal and petroleum products 28.7 19.2 33.3 26.6 22.7 27.6 44.2 21.5 93.9 S 25.9 S
20-24 Pharmaceutical and chemical products 15.2 14.6 29.0 25.7 12.7 74.7 26.7 16.9 69.4 21.3 15.3 41.7
25-30 Logs, wood products, and textile and leather 27.3 4.8 34.2 36.4 13.1 55.7 41.2 15.5 78.6 12.5 15.1 21.3
31-34 Base metal and machinery 8.7 10.8 15.5 15.4 10.4 11.9 13.5 7.4 16.7 21.1 18.2 34.8
35-38 Electronic, motorized vehicles, and precision instruments 14.2 14.4 20.5 23.5 11.7 26.0 25.6 14.8 33.7 9.1 22.0 37.7
39-43 Furniture, mixed freight and misc manufactured products 11.7 22.8 39.0 7.0 25.1 19.6 10.7 13.0 15.9 41.7 9.5 23.9
-- Commodity Unknown 40.1 43.5 20.8 40.1 S S S S S 27.0 33.0 164.4

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.