Baron & Kenny (1986) The moderator-mediator variable distinction
14 important questions on Baron & Kenny (1986) The moderator-mediator variable distinction
Two functions of third variables are often confused
2. Mediator function > which represents the generative mechanism through which the focal independent variable is able to influence the dependent variable of interest
When will a moderator effect within a correlational framework occur
within ANOVA, a basic moderator effect can be represented as an interaction between a focal varible and a factor that specifies the appropriate conditions for its operation
moderator interaction effect also would be said to occur if a relation is substantially reduced insted of being reversed
What is the general procedure for testing moderation
2. Evaluate moderation hypothesis
3. Perform follow up analysis to interpret interaction (if statistically significant)
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Testing moderation, what does this depend on
When do we use multiple linear regression in moderation
or
if X and/or Z are categorical and Y is continuous
Age as moderator; is RP relationship quality associated with depression for older and younger adolescents?
how would you research this in steps?
- Identify Ms of both predictors
- Then subtract Ms from each individual score
- So you now have centered scores for relationship quality and age.
Step 2)
- Multiply the two centered scores to create the interaction
Step 3)
- Perform the MLinR
Step 4a) calculate simple slopes
Step 4b) identify H/L values of Z
Identify high and low values for z (moderator).
Step 4C) calculate simple slopes for H/L values of moderator (z)
Step 4D) calculate points to plot by solving for predictor values
Step 4e) test simple slopes
When do we use linear regression with modulation
or
When Y is categorical
What happens when Y is categorical at moderation
- And X and Z are continuous
Using the centered scores of X and Z, include both predictors as well as the interaction
- And X is continuous and Z is categorical
Using the centered scores of X and the coded scores of Z, include both predictors as well as the interaction
When are moderators typically measured
important distinction with mediators
What does mediator variable serve
What are the mediation design issues
Mediator could be chosen too close in time to X or Y
o Reverse causal effects (alternative models)
o Omitted variables
o Moderated mediation/ mediated moderation?
What does the mediation describe
How is mediation tested
Implications and applications of the moderator- mediator distinction
- behavior intention behavior relation
- linking the global dispositions to behavior; attitudes and traits
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