Examining changes

Abstract

In this talk I will mainly focus on what to do when analyzing difference scores (e.g., pretest/ posttest). Important questions that I will address include:

• When should difference scores or ANCOVA be used?
• Is there any difference between both approaches?
• If so, when should we use what?
  Moreover, I will also address two particular issues (…). You can expect at least some information concerning the following topics:
• Repeated measures ANOVA versus MANOVA: Difference between them, when to choose each approach.
• Missing values: What to do? (Here only generic pointers will be provided.)