# Tag Info

### What if path c isn't significant, but paths a and b are? Indirect effect in mediation

Your approach to testing mediation appears to conform to the "causal steps approach" described in the classic methods paper by Baron & Kenny (1986). This approach to mediation entails the ...
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### When is it inappropriate to control for a variable?

I believe the quick one-sentence answer to your question, When is it appropriate to control for variable Y and when not? is the "back-door criterion". Judea Pearl's Structural Causal Model can ...
• 3,204
Accepted

### Interpreting Mediation Output when Direct Effect is not Stat. Sig but ACME and Total are

This does suggest a "full" mediation, in which all of the IV's influence is mediated. The ACME being significant shows that the mediating process appears to be present. On the other hand, you don't ...
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### Alternatives to the Baron-Kenny approach to modeling mediation

Baron and Kenny are indeed outdated, though that does not make them wrong in all cases. The concerns divide into broadly statistical limitations and assumptions which are discussed in the reference ...
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Accepted

### Serial Mediation in R - how to setup the model?

This should probably be migrated to StackOverflow since it is about software, but: You could do this in the R package lavaan. In your model, you would first ...
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### mediator or moderator variable?

Moderating variables (aka effect modifier, interacting variable, etc.) alter the effect of another variable. In your example increased stress causes decreased well-being, but this effect is altered in ...
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### Alternatives to the Baron-Kenny approach to modeling mediation

This is more a discussion of concerns I have firstly with the approach of Baron and Kenny (which has some bearing on your question), and with a number of more recent papers (I haven't seen them all, ...
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Accepted

### When is it inappropriate to control for a variable?

Conditioning (i.e. adjusting) the probabilities of some outcome given some predictor on third variables is widely practiced, but as you rightly point out, may actually introduce bias into the ...
• 27k
Accepted

### R - moderated mediation using the lavaan package

I posted this question in another location and was provided the answer by Terry Jorgenson. Question and answer: I would like to calculate the conditional indirect effects of ...
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### Is 'indirect effect' the same as 'mediation'?

No, "mediation" and "indirect effect" are not synonymous. For example, when analyzing complex causal systems in which any variable in the system at time $t$ contributes causally to every variable in ...
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### Testing mediation and moderation; can one variable function as both mediator and moderator?

From definitions, I feel that a variable can not simultaneously function as mediator and moderator. Let's try to investigate both effects: Mediaiton Mediation is a hypothesized causal chain in which ...
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Accepted

### Causal Mediation Analysis - Negative indirect and total effect, positive direct effect

In mediation analysis, whatever the estimation procedure, it is totally fine to obtain direct and indirect effects with opposite directions. This situation is sometimes referred to as "inconsistent ...
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Accepted

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### Mediation analysis: How to interpret an insignificant indirect + insignificant direct effect?

Remember that having p>.05 doesn't mean there is no effect. It means you don't have enough evidence to make a conclusion about the presence or absence of an effect. You do not have enough evidence to ...
• 24.3k

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