IDC is a graphical identification algorithm for causal queries conditioned on evidence. It extends ID by using a directed acyclic graph to determine whether an intervention query, such as an effect on the treated, can be reduced to an observational estimand. section 10.7.2
IDC simplifies conditioned identification problems by:
- Removing irrelevant variables and decomposing the graph into c-component subgraphs. section 10.7.2
- Applying do-calculus to reduce intervention terms, block confounding backdoor paths, and factorize queries. section 10.7.2
- Returning a non-identifiable result when the graph permits no further simplification. section 10.7.2
