MANOVA

Question 1

What are the MANOVA assumptions?

Answer 1

• onafhankelijkheid
• multivariate normaliteit van de afhankelijke variabelen
• within covariantie matrices gelijk voor alle groepen
• geen meetfout
• lineair verband tussen alle groepen

Question 2

In case of multiple dependent variables, why is it preferred to do a MANOVA in stead of multiple univariate ANOVA’s?

Answer 2

• several criterion measures will provide a more complete and detailed description of the phenomenon under investigation
• multiple univariate tests inflate overall type 1 error rate
• univariate analysis ignore important information: association between the dependent variables
• the use of a total score may not reveal significant effects due to a canceling out effect