Table B-5. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group for CBSA of Origin: 2002

Table B-5. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group for CBSA of Origin: 2002

[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]

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Commodity Group (2-digit SCTG) Value Tons Ton-miles CV of average miles per shipment
CV Std. error of percent CV Std. error of percent CV Std. error of percent
All Commodities 7.0 41.5 17.5 13.9
01-05 Agriculture products and fish 35.9 1.5 29.0 6.0 30.6 9.8 S
06-09 Grains, alcohol, and tobacco products 32.6 3.6 33.6 3.9 36.0 4.7 S
10-14 Stones, non-metallic minerals, and metallic ores 45.8 0.2 12.6 3.3 35.0 0.7 33.3
15-19 Coal and petroleum products 47.7 1.8 42.9 5.6 40.1 5.7 S
20-24 Pharmaceutical and chemical products 18.8 2.1 24.6 0.5 30.3 1.4 23.5
25-30 Logs, wood products, and textile and leather 12.0 0.7 10.0 1.0 12.1 0.9 10.9
31-34 Base metal and machinery 18.3 2.5 S S 45.0 3.7 35.5
35-38 Electronic, motorized vehicles, and precision instruments 13.5 2.6 18.4 0.2 13.7 0.4 6.3
39-43 Furniture and miscellaneous manufactured products 10.5 2.0 21.6 3.0 18.7 0.6 10.9
Commodity Unknown 31.6 S S S S 26.0

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

NOTES: The Introduction and appendixes give information on confidentially protection, sampling error, nonsampling error, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.
Coverage for the 2002 Commodity Flow Survey (CFS) differs from the previous surveys due to a change from the 1987 Standard Industrial Classification System to the 1997 North American Industry Classification System and other survey improvements. Therefore, data users are urged to use caution when comparing 2002 CFS estimates with estimates from prior years.

SOURCE: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Metropolitan Data, December 2004.