Archive:MANOVA
Template:0%done The purpose of this tutorial is to teach use of multivariate analysis of variance (MANOVA), with practical exercises based on using SPSS. |
What is MANOVA?
- A multivariate extension of univariate ANOVA
- If you have two or more dependent variables (ANOVA analyses only a single DV at a time)
Examples
Effects of chemotherapy and memory enhancement training on cognitive functioning in Alzheimer's patients
IVs (factors)
- Chemotherapy (drug vs no-drug)
- Memory training (training vs no-training)
Several measures of cognitive functioning:
- Test of reading comprehension and retention
- Memory for names and faces
- Ratings provided by family members
Usage
- Alternatively, could use a series of univariate ANOVAs - one for each dependent variable - MANOVA does all these univariate tests simultaneously.
- Most commonly used in laboratory research (where we experimentally manipulate factors), but can be used in any design where we want to answer questions about whether different levels of the IVs affect a combination of DVs.
- "Because of the increase in complexity and ambiguity of results with MANOVA, one of the best overall recommendations is: Avoid it if you can." Tabachnick and Fidell (1983, p.230)
- In other words - be sure it is really the best approach to use (e.g., sometimes a mixed ANOVA could be a better approach).
References
- Hair et al. (1998) Chapter 6
- Tabachnick & Fidell (1996) Chapter 9 (more recent editions are available)
External links
- MANOVA (ucspace)
- MANOVA Notes (Handout)