Multiple Causes of Behavior Factorial Designs Multiple Causes of Behavior

Simplest Experiment Self Other IV DV

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

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

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

Simplest Factorial Design DV Self Positive Level 1 Other Negative Level 2

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

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

Main Effects

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

Interaction

What is this?

What does a factorial design tell us? Main Effects Interaction