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Cronbach's alpha
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==Prerequisites for using Cronbach's alpha== To use Cronbach's alpha as a reliability coefficient, the following conditions must be met:<ref>{{Cite journal|last=Spiliotopoulou|first=Georgia|date=2009|title=Reliability reconsidered: Cronbach's alpha and paediatric assessment in occupational therapy|url=https://onlinelibrary.wiley.com/doi/10.1111/j.1440-1630.2009.00785.x|journal=Australian Occupational Therapy Journal|language=en|volume=56|issue=3|pages=150β155|doi=10.1111/j.1440-1630.2009.00785.x|pmid=20854508|access-date=2022-10-21|archive-date=2022-10-21|archive-url=https://web.archive.org/web/20221021235248/https://onlinelibrary.wiley.com/doi/10.1111/j.1440-1630.2009.00785.x|url-status=live}}</ref><ref>{{Cite journal|last=Cortina|first=Jose M.|date=1993|title=What is coefficient alpha? An examination of theory and applications.|url=http://doi.apa.org/getdoi.cfm?doi=10.1037/0021-9010.78.1.98|journal=Journal of Applied Psychology|language=en|volume=78|issue=1|pages=98β104|doi=10.1037/0021-9010.78.1.98|issn=1939-1854|access-date=2022-10-21|archive-date=2023-08-13|archive-url=https://web.archive.org/web/20230813121351/https://psycnet.apa.org/doiLanding?doi=10.1037/0021-9010.78.1.98|url-status=live|url-access=subscription}}</ref> # The data is [[Normal distribution|normally distributed]] and [[Linearity|linear]]{{Efn|This implicitly requires that the data can be ordered, and thus requires that it is not [[Level_of_measurement#Nominal_level|nominal]].|group=lower-roman|name=Footnote2}}; # The compared tests or measures are essentially tau-equivalent; # Errors in the measurements are [[Independence (statistics)|independent]].
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