[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
|Mode of transportation||Ton-miles||CV of Average miles per shipment|
|CV||Std. error of percent|
|Parcel, U.S.P.S. or courier||4.2||–||2.3|
|Other and unknown modes||9.7||0.2||13.0|
– 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 on 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, United States Data, December 2004.