Week Seven - Three Way Anova

Question 1

What does a 3 factor anova produce?

Answer 1

Main effect of each IV (A, B, C)
Two-way interactions (AB, AC, BC) - first order interaction
Three way interaction (ABC) - second order interaction

Question 2

How to interpret three-way results (non-sig 3 way)?

Answer 2

Discuss main effects (detail depends on whether two way interactions are present or not)

if any sig two way - follow up with simple main effects with BA or post hoc if more than 2 levels

Question 3

What are you asking in a three-way interaction?

Answer 3

Is the interaction between IV A and IV B the same at all levels of IV C

Question 4

What to do when you have a significant three-way interaction?

Answer 4

Tests of simple interaction to see where the sig interaction is, followed with tests of simple main effects

Question 5

The combination of the three-way interaction follow up should be based on what?

Answer 5

Theoretical considerations - what the researcher is asking