Package edu.cmu.tetrad.search.utils

Interface R0R4Strategy

All Known Implementing Classes:
R0R4StrategyScoreBased, R0R4StrategyTestBased
public interface R0R4Strategy
The FCI orientation rules are almost entirely taken up with an examination of the FCI graph, but there are two rules that require looking at the distribution. The first is the R0 rule, which orients unshielded colliders in the graph. The second is the R4 rule, which orients certain colliders or tails based on an examination of discriminating paths. For the discriminating path rule, we need to know the sepset for two nodes, e and c, which can only be determined by looking at the distribution.

Note that for searches from Oracle, the distribution is not available, but these rules can be applied using knowledge of the true DAG (with latents).

Since this can be done in various ways, we separate out a Strategy here for this purpose.

Author:
josephramsey

  • Method Details

    • isUnshieldedCollider

      boolean isUnshieldedCollider(Graph graph, Node a, Node b, Node c)
      Determines if a given triple is an unshielded collider based on an examination of the data.
      Parameters:
      graph - the graph representation
      a - the first node of the collider path
      b - the second node of the collider path
      c - the third node of the collider path
      Returns:
      true if the collider is unshielded, false otherwise

    • doDiscriminatingPathOrientation

      org.apache.commons.lang3.tuple.Pair<DiscriminatingPath,Boolean> doDiscriminatingPathOrientation(DiscriminatingPath discriminatingPath, Graph graph)
      Does a discriminating path orientation based on an examination of the data.
      Parameters:
      discriminatingPath - the discriminating path construct
      graph - the graph to be oriented.
      Returns:
      a pair of the discriminating path construct and a boolean indicating whether the orientation was determined.
      See Also:

    • setKnowledge

      void setKnowledge(Knowledge knowledge)
      Sets the knowledge object to be used by the strategy.
      Parameters:
      knowledge - the knowledge object.

    • getknowledge

      Knowledge getknowledge()
      Returns the knowledge object used by the strategy.
      Returns:
      the knowledge object.

    • setAllowedColliders

      void setAllowedColliders(Set<Triple> allowedColliders)
      Sets the allowed colliders for the current strategy.
      Parameters:
      allowedColliders - a Set of Triple objects representing the allowed colliders

    • getInitialAllowedColliders

      default Set<Triple> getInitialAllowedColliders()
      Returns the allowed colliders for the current strategy.
      Returns:
      a Set of Triple objects representing the allowed colliders

    • setInitialAllowedColliders

      default void setInitialAllowedColliders(HashSet<Triple> initialAllowedColliders)
      Sets the initial allowed colliders for the current strategy.
      Parameters:
      initialAllowedColliders - a Set of Triple objects representing the allowed colliders