1. Multiple Causes of Behavior
Factorial Designs
Multiple Causes of Behavior

2. Simplest Experiment
Self
Other IV DV

3. Terminology
Factors
An independent variable (usually in factorial designs)
Level
The number of groups within each IV

4. Simplest Experiment Self Other 1 Factor = > Instructions DV
2 Levels = > (1) Self & (2) Other DV

5. Factorial Design
Contains, at least, two factors, each with two levels

6. Simplest Factorial DesignDV
Self
Positive
Level 1
Other
Negative
Level 2

7. Terms Applied to Factorial Designs
3 x 2
Number of Factors
Number of Levels
Number of Conditions 2 3 2 6

8. What does a factorial design tell us?
Main Effect
The overall effect of an IV in a factorial design

9. Main Effects

10. What does a factorial design tell us?
Main Effect
Interaction
When the effect of one factor changes depending on the level of another factor

11. Interaction

12. What is this?

13. What does a factorial design tell us?
Main Effects
Interaction