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mediation and moderation
Fichas del conjunto (10)
- 1What is the difference between mediation and moderation?Mediation investigates HOW X --> Y
Moderation investigates WHEN X --> Y - 2What is mediation?Mediator is related to both predictor and outcome
A change in the predictor then changes the mediator, which in turn changes the outcome
Mediation is all about indirect effects of X on Y - 3What are the three key steps in mediation analysis?1. Does the predictor predict the outcome?
2. Does the predictor predict the mediator?
3 . Does the predictor predict the outcome, controlling for the predictor?
(3b. Once we have accounted for the indirect effect, does the predictor still predict the outcome?) - 4How is the total effect found?Simple regression X --> Y
Labelled c
Look at unstandardized coefficient B (not the constant) - 5What is the equation for the total effect?c = ab + c'
total effect = indirect effect + direct effect - 6How can you tell if the total effect is significant?Bootstrapped CIs - if 95% CI does not include 0, then the direct effect is significant (gives indication of accuracy of test)
- 7What is b1?The effect of a predictor on the outcome, estimated when all other variables in the model are zero
When there's an interaction, the b parameter changes depending on the value of the other predictors - the moderator - 8In moderation, why must you include the main effects for both the predictor and moderator?Otherwise the interaction and main effects are confounded and a significant interaction can’t be interpreted
- 9How do you do grand mean centring?Subtract the mean from each participant's score
Do this for the predictor and the moderator but not the interaction - 10What is simple slopes analysis?Process used in moderation which involves probing interactions by looking at the X --> Y relationship at different values of the moderator
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- Fichas sobre mediation and moderation, creado por emking23 el 30/05/2015.
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- emking23
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