Discovering Statistics; Chapter 10 Flashcards
1
Q
What is centring?
A
The process of transforming a variable into deviations around a fixed point.
2
Q
What is grand mean centring?
A
Transforming variables into deviations around the grand mean.
3
Q
What is a direct effect?
A
Effect of a predictor on the outcome when a mediator is present.
4
Q
What is an indirect effect? (Similar to interaction effect)
A
Effect of a predictor on the outcome via the mediator.
unstandardized indirect effect = a x b
5
Q
What does the Sobel test tell us?
A
If significant, predictor affects outcome via moderator.
6
Q
How do you calculate partially standardized indirect effect?
A
ab / SDoutcome
7
Q
How do you calculate standardized indirect effect?
A
(ab / SDoutcome) x SDpredictor
Sometimes referred to as ‘index of mediation’
