[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]
|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|
|01-05 Agriculture products and fish||21.5||1.5||40.2||3.0||43.4||3.5||S|
|06-09 Grains, alcohol, and tobacco products||14.2||1.3||29.7||1.4||25.3||0.6||S|
|10-14 Stones, non-metallic minerals, and metallic ores||19.1||–||31.4||5.8||45.4||3.8||15.3|
|15-19 Coal and petroleum products||26.1||1.1||23.9||2.4||21.7||1.2||34.6|
|20-24 Pharmaceutical and chemical products||12.3||1.9||30.5||4.5||41.2||6.9||19.5|
|25-30 Logs, wood products, and textile and leather||30.9||5.0||22.5||3.8||13.7||6.6||8.2|
|31-34 Base metal and machinery||38.6||3.9||S||S||S||S||15.6|
|35-38 Electronic, motorized vehicles, and precision instruments||12.5||2.5||18.0||0.3||15.8||0.7||28.8|
|39-43 Furniture and miscellaneous manufactured products||11.3||1.5||35.4||0.9||12.8||0.6||8.7|
– 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
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.