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Identification of Strong Edges in AMP Chain Graphs
Proceedings of the 34th Conference on Uncertainty in Artificial Intelligence, PMLR R16:32-41, 2018.
Abstract
The essential graph is a distinguished member of a Markov equivalence class of AMP chain graphs. However, the directed edges in the es- sential graph are not necessarily strong or in- variant, i.e. they may not be shared by every member of the equivalence class. Likewise for the undirected edges. In this paper, we develop a procedure for identifying which edges in an essential graph are strong. We also show how this makes it possible to bound some causal ef- fects when the true chain graph is unknown.