Term	Census Undercount
Synonym	Gross Census Undercount Undercount Undercoverage Under-enumeration
Related Term
Source of Definition
Short Definition
Statistical Activity	Demography

Definition
The number of people missed by a census who were meant to be counted. It is usually expressed as a percentage of what should have been the complete count rather than as a percentage of what was counted.

Net census undercount is the difference between census undercount and overcount.

Example
The 1996 and 2001 post-enumeration surveys estimated (gross) census undercount of the New Zealand population to be 1.8 ± 0.2 and 2.8 ± 0.3 percent, respectively (sample errors at the 95 percent level).