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DAG stands for Directed Acyclic Graph. DAGs are commonly used to help people think about causal patterns amongst variables.
2
votes
Accepted
Directed Acyclic Graphs and the no unrepresented prior common causes assumption
I guess you could say that they are not proper "variables", and therefore do not have to be included in the DAG.
I am not aware of a thorough discussion of this question in the literature. …
38
votes
Accepted
A layman understanding of the difference between back-door and front-door adjustment
Let's say you are interested in the causal effect of $D$ on $Y$. The following statement are not quite precise but I think convey the intuition behind the two approaches:
Back-door adjustment: Determ …
1
vote
Accepted
DAG: when should we use variables marked as "adjusted"?
In dagitty, when you indicate that a variable $A$ is "adjusted", you indicate that you will definitely adjust/control for it in the analysis. Dagitty will then tell you whether and how you can still e …
15
votes
Accepted
Representing interaction effects in directed acyclic graphs
Let's have a look at the structural equations in your case, which correspond to your "DAG" stripped of the red arrow:
Mesothelioma = $f_{1}$(Tobacco, Asbestos, $\epsilon_{m}$)
Tobacco = $f_{2}$($\epsilon …