Lecture 24/25: Mediation/Moderation

Question 1

What is a mediation model

Answer 1

A model that seeks to identify and explain the mechanisms or process that underlies an observed relationship between an independent and a dependent variable via the inclusion of a third hypothetical variable, known as a mediator variable

Question 2

Which assumption can we fix with mediation

Answer 2

Multicollinearity

Question 3

What does the R squared stand for

Answer 3

How much variance is explained by the model

Question 4

What are a, b, c, and c’

Answer 4

a = effect of predictor on mediator
b = effect of mediator on outcome
a*b = indirect effect
c = total effect
c’ = direct effect
c - c’ = indirect effect

Question 5

Can we make causal inferences from mediation analysis and why (not)?

Answer 5

No, because we can only make causal inferences when we are doing experimental research

Question 6

When does moderation occur

Answer 6

When the relationship between two variables depends on a third variable, which is referred to as the moderator; it has an interaction effect

Question 7

Which part of the following formula is the moderator; Outcome = b0 + b1Pred + b2Mod + b3*Pred x Mod + e

Answer 7

b3*Pred x Mod