2901.0 - Census of Population and Housing: Census Dictionary, 2016
ARCHIVED ISSUE Released at 11:30 AM (CANBERRA TIME) 23/08/2016
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Undercount and/or underenumeration
Although extensive efforts are made to contact all occupied dwellings and count all unoccupied private dwellings in the Census, locating and contacting them all is not possible. Some dwellings may not be identified. For example, flats above or behind shops or attached to private dwellings may not be included in the Census. Analysis of the undercount in previous Censuses has shown that people away from their usual residence on Census night (for example, travelling, camping, staying in a non-private dwelling, or visiting friends) are more likely to be missed than people at home on Census night.
Even when a household is contacted, undercount is possible if not all members of the household can be included on the form (six people can be recorded on the paper form and ten on the online form) no extra online or paper forms are obtained. Undercount is also possible if the household, or a member of the household, refuses to cooperate and complete a Census form.
A measure of the extent of underenumeration is obtained from the Post Enumeration Survey (PES). The official population estimates produced by the ABS take into account the results of the PES. However, the Census counts are not adjusted.
See also Estimated Resident Population (ERP), Post Enumeration Survey (PES).