Editing Personality test (section)

===Non-response===
Firstly, item non-response needs to be addressed. Non-response can either be ''unit'', where a person gave no response for any of the ''n'' items, or ''item'', i.e., individual question. Unit non-response is generally dealt with exclusion.<ref name="Mellenbergh, 2008">{{cite book |last=Mellenbergh |first=G.J. |author-link=Gideon J. Mellenbergh |chapter=Chapter 11 - Tests and questionnaires: Analysis |pages=235–70 |chapter-url=https://books.google.com/books?id=LCnOj4ZFyjkC&pg=PA235 |editor-last=Adèr | editor-first=H.J. |editor-link=Herman J. Adèr | editor-last2=Mellenbergh | editor-first2=G.J. | title=Advising on Research Methods: A Consultant's Companion | publisher=Johannes Van Kessel Publishing | year=2008 | isbn=978-90-79418-01-5 }}</ref> Item non-response should be handled by [[Imputation (statistics)|imputation]] – the method used can vary between test and questionnaire items.