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 40.9 21.0 127.1 46.0 37.6 47.8 29.4 30.0 66.0 43.8 S S
01-05 Agriculture products and fish 48.5 S S S S S S S S 32.4 31.3 35.2
06-09 Grains, alcohol, and tobacco products 23.1 34.6 39.5 27.4 S S 29.2 46.3 26.8 38.0 29.8 162.9
10-14 Stones, non-metallic minerals, and metallic ores S S S S S S S S S 31.6 31.6 287.7
15-19 Coal and petroleum products S - S S - S S - S 31.6 - -
20-24 Pharmaceutical and chemical products S S S 42.0 S S S S S 37.4 28.2 631.1
25-30 Logs, wood products, and textile and leather S 46.6 S 38.9 35.7 39.5 41.6 S S 28.0 33.9 33.6
31-34 Base metal and machinery 32.7 41.7 23.3 S 46.1 S S 49.9 S S S S
35-38 Electronic, motorized vehicles, and precision instruments S S S 43.8 S S S S S S 31.6 S
39-43 Furniture, mixed freight and misc manufactured products 30.8 48.3 206.6 24.6 S S 28.5 S S 35.0 41.1 61.0
-- Commodity Unknown S S S S S S S S S S 31.6 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.