Package edu.cmu.tetrad.search.utils

Class DagSepsets

java.lang.Object
edu.cmu.tetrad.search.utils.DagSepsets
All Implemented Interfaces:
SepsetProducer
public class DagSepsets extends Object implements SepsetProducer
Determines sepsets, collider, and noncolliders by examining d-separation facts in a DAG.
Version:
$Id: $Id
Author:
josephramsey

  • Constructor Details

    • DagSepsets

      public DagSepsets(Graph dag)
      Constructs a new DagSepsets object for the given DAG.
      Parameters:
      dag - the DAG.

  • Method Details

    • getSepset

      public Set<Node> getSepset(Node a, Node b)

      getSepset.

      Returns the list of sepset for {a, b}.

      Specified by:
      getSepset in interface SepsetProducer
      Parameters:
      a - a Node object
      b - a Node object
      Returns:
      a Set object

    • getSepsetContaining

      public Set<Node> getSepsetContaining(Node a, Node b, Set<Node> s)
      Returns the sepset containing nodes 'a' and 'b' that also contains all the nodes in the given set 's'. Note that for the DAG case, it is expected that any sepset containing 'a' and 'b' will contain all the nodes in 's'; otherwise, an exception is thrown.
      Specified by:
      getSepsetContaining in interface SepsetProducer
      Parameters:
      a - The first node.
      b - The second node.
      s - The set of nodes that must be contained in the sepset.
      Returns:
      The sepset containing 'a' and 'b' that also contains all the nodes in 's'.
      Throws:
      IllegalArgumentException - If the sepset of 'a' and 'b' does not contain all the nodes in 's'.

    • isUnshieldedCollider

      public boolean isUnshieldedCollider(Node i, Node j, Node k)

      isUnshieldedCollider.

      True iff i*-*j*-*k is an unshielded collider.

      Specified by:
      isUnshieldedCollider in interface SepsetProducer
      Parameters:
      i - a Node object
      j - a Node object
      k - a Node object
      Returns:
      a boolean

    • getScore

      public double getScore()

      getScore.

      Not implemented; required for an interface.

      Specified by:
      getScore in interface SepsetProducer
      Returns:
      a double

    • isIndependent

      public boolean isIndependent(Node a, Node b, Set<Node> sepset)

      isIndependent.

      Returns true just in case msep(a, b | c) in the DAG. Don't let the name isIndependent fool you; this is a d-separation method. We only use the name isIndependent so that this can be used in place of an independence check.

      Specified by:
      isIndependent in interface SepsetProducer
      Parameters:
      a - a Node object
      b - a Node object
      sepset - a Set object
      Returns:
      a boolean

    • getPValue

      public double getPValue(Node a, Node b, Set<Node> sepset)
      Description copied from interface: SepsetProducer
      Calculates the p-value for a statistical test a _||_ b | sepset.
      Specified by:
      getPValue in interface SepsetProducer
      Parameters:
      a - the first node
      b - the second node
      sepset - the set of nodes
      Returns:
      the p-value for the statistical test
      Throws:
      javax.help.UnsupportedOperationException - if this method is called.

    • getVariables

      public List<Node> getVariables()

      getVariables.

      Returns the nodes in the DAG.

      Specified by:
      getVariables in interface SepsetProducer
      Returns:
      a List object

    • setVerbose

      public void setVerbose(boolean verbose)

      setVerbose.

      Thsi method is not used.

      Specified by:
      setVerbose in interface SepsetProducer
      Parameters:
      verbose - a boolean

    • getDag

      public Graph getDag()
      Returns the DAG being analyzed.
      Returns:
      This DAG.