Residual category

Residual categories are universal classification categories that capture particular types of survey responses. This includes non-response (common to all surveys), for which a standard residual category descriptor may be used, such as ‘not stated’ or ‘response unidentifiable’.

See also ‘Don’t know’, ‘Not stated’, ‘Refused to answer’, ‘Response outside scope’, and ‘Response unidentifiable’ in this definitions group.