Table B-1a. Estimated Measures of Reliability for Export Shipment Characteristics by Export Mode: 2002
[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
|Export mode of transportation||Value||Tons|
|CV Value 02||Std. error of percent||CV Tons 02||Std. error of percent|
|Air (including truck and air)||7.5||1.3||11.2||0.2|
|Parcel, U.S.P.S. or courier||11.0||0.5||31.4||–|
|Truck and rail||–||–||–||–|
|All other multiple modes||27.7||1.5||15.2||0.9|
|Other and unknown modes||13.8||0.3||28.6||0.4|
– Represents an estimate 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: Research and Innovative Technologies Administration, Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Export Data, March 2005.