Editing Personality test (section)

===Analysis===
A respondent's response is used to compute the analysis. Analysis of data is a long process. Two major theories are used here: classical test theory (CTT), used for the observed score;<ref>See: {{cite book |last1=Lord |first1=F.M. |last2=Novick |first2=M.R. |year=1968 |title=Statistical theories of mental test scores |place=Reading, MA |publisher=Addison-Wesley}}</ref> and item response theory (IRT), "a family of models for persons' responses to items".<ref>{{cite book |last=Mellenbergh |first=G.J. |author-link=Gideon J. Mellenbergh |chapter=Chapter 11 - Tests and questionnaires: Analysis |page=[https://books.google.com/books?id=LCnOj4ZFyjkC&pg=PA244 244] |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><ref>For a full summary of IRT, see: {{citation | last1=Hambleton | first1=R.K. | last2=Swaminathan | first2=H. |date=April 1985 | title=A Look at Psychometrics in the Netherlands | url=https://files.eric.ed.gov/fulltext/ED273665.pdf | id={{ERIC|ED273665}} }}</ref> The two theories focus upon different 'levels' of responses and researchers are implored to use both in order to fully appreciate their results.