Under(over)coverage; under(over)count.

A nonspecific term representing either the rate or number of individuals missed (erroneously included) in the decennial census. More specifically, gross undercoverage and gross undercount are the rate or number of those missed for a demographic group or geographic area (similarly for gross overcoverage and gross overcount); net undercoverage and net undercount are the difference between the rate or number of those missed for a demographic group or geographic area and the rate or number of those erroneously included; differential (net) undercoverage and differential (net) undercount are the difference between the rate or number of net undercoverage between two demographic groups or between two geographic areas.

Unduplication.

The process by which individuals reported on more than one census questionnaire are identified and counted once at only one geographic location.

Update/leave

(also known as update/leave/mailback). A method of census enumeration used in areas lacking city-style addresses in which the census questionnaire is delivered to an address by a census enumerator. The Master Address File is corrected at the time of delivery (if necessary). Residents at the address are asked to fill out the questionnaire and mail it back.



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