9. Factorial designs and the GLM Flashcards
Why are predictor variables referred to as independent variables?
Because their value is independent of other variables
Why are outcome variables referred to as dependent variables?
Because their value ‘depends’ upon other variables
What is a factorial design?
Two or more predictor variables/IV have been manipulated
What is an n-way design?
The number of predictor variables/IVs manipulated
What is independent design?
Different entities in all conditions
What is repeated measures design?
The same entities in all conditions
What is mixed design?
Different entities in all conditions of at least one predictor/IV, the same entities in all conditions of at least one other predictor variable/IV
What is an interaction term?
The product of two variables
What does it mean if the interaction term is significant?
We have a significant moderation effect
What does the parameter estimate (b) for the interaction quantify?
The size of the interaction effect
In factorial designs, the effect of one predictor is stronger when?
In certain categories of the other predictor
It is never sensible to interpret main effects in the presence of…
A significant interaction effect
