Package edu.cmu.tetrad.search.work_in_progress

Class IndTestSepsetDci

java.lang.Object

edu.cmu.tetrad.search.work_in_progress.IndTestSepsetDci

All Implemented Interfaces:

IndependenceTest

public class IndTestSepsetDci
extends Object
implements IndependenceTest

Checks independence facts for variables associated with a sepset by simply querying the sepset

Version:

$Id: $Id

Author:

Robert Tillman

Constructor Summary

Constructors

Constructor	Description
IndTestSepsetDci(SepsetMapDci sepset, List<Node> nodes)	Constructs a new independence test that returns d-separation facts for the given graph as independence results.

Method Summary

Modifier and Type	Method	Description
IndependenceResult	checkIndependence(Node x, Node y, Set<Node> z)	Checks the independence between two nodes, given a set of conditioning nodes.
boolean	determines(List<Node> z, Node x1)	Determines if a given Node is present in a List of Nodes.
double	getAlpha()	getAlpha.
DataSet	getData()	getData.
Node	getNode(Node variable)	getNode.
double	getPValue()	Needed for IndependenceTest interface.
Node	getVariable(Node node)	getVariable.
Node	getVariable(String name)	Retrieves the variable with the specified name.
List<Node>	getVariables()	getVariables.
IndependenceTest	indTestSubset(List<Node> vars)	Determines independence between a subset of variables.
boolean	isVerbose()	isVerbose.
void	setAlpha(double alpha)	Sets the alpha level for the independence test.
void	setVerbose(boolean verbose)	Sets the verbose flag.
String	toString()	toString.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface edu.cmu.tetrad.search.IndependenceTest

checkIndependence, determines, getCov, getDataSets, getSampleSize, getVariableNames

Constructor Details

IndTestSepsetDci

public IndTestSepsetDci(SepsetMapDci sepset,
 List<Node> nodes)

Constructs a new independence test that returns d-separation facts for the given graph as independence results.

Parameters:

sepset - a SepsetMapDci object

nodes - a List object

Method Details

indTestSubset

public IndependenceTest indTestSubset(List<Node> vars)

Determines independence between a subset of variables.

Specified by:

indTestSubset in interface IndependenceTest

Parameters:

vars - The sublist of variables.

Returns:

This IndependenceTest object.

Throws:

IllegalArgumentException - If the subset is empty or contains variables that are not original variables.

checkIndependence

public IndependenceResult checkIndependence(Node x,
 Node y,
 Set<Node> z)

Checks the independence between two nodes, given a set of conditioning nodes.

Specified by:

checkIndependence in interface IndependenceTest

Parameters:

x - A Node object representing the first node.

y - A Node object representing the second node.

z - A set representing the set of conditioning nodes.

Returns:

An IndependenceResult object containing the result of the independence test.

Throws:

NullPointerException - if z is null or if any node in z is null.

RuntimeException - if the p-value is undefined.

See Also:

• IndependenceResult

getPValue

public double getPValue()

Needed for IndependenceTest interface. P value is not meaningful here.

Returns:

a double

getVariables

public List<Node> getVariables()

getVariables.

Specified by:

getVariables in interface IndependenceTest

Returns:

the list of TetradNodes over which this independence checker is capable of determinine independence relations-- that is, all the variables in the given graph or the given data set.

determines

public boolean determines(List<Node> z,
 Node x1)

Determines if a given Node is present in a List of Nodes.

Parameters:

z - The List of Nodes to search in.

x1 - The Node to search for.

Returns:

True if the Node x1 is present in the List z, otherwise False.

getAlpha

public double getAlpha()

getAlpha.

Specified by:

getAlpha in interface IndependenceTest

Returns:

a double

setAlpha

public void setAlpha(double alpha)

Sets the alpha level for the independence test.

Specified by:

setAlpha in interface IndependenceTest

Parameters:

alpha - The alpha level to be set.

getVariable

public Node getVariable(String name)

Retrieves the variable with the specified name.

Specified by:

getVariable in interface IndependenceTest

Parameters:

name - the name of the variable to retrieve

Returns:

the variable with the specified name, or null if not found

getVariable

public Node getVariable(Node node)

getVariable.

Parameters:

node - a Node object

Returns:

the variable associated with the given node in the graph.

getNode

public Node getNode(Node variable)

getNode.

Parameters:

variable - a Node object

Returns:

the node associated with the given variable in the graph.

toString

public String toString()

toString.

Specified by:

toString in interface IndependenceTest

Overrides:

toString in class Object

Returns:

a String object

getData

public DataSet getData()

getData.

Specified by:

getData in interface IndependenceTest

Returns:

a DataSet object

See Also:

• DataSet
• ICovarianceMatrix
• DataModel

isVerbose

public boolean isVerbose()

isVerbose.

Specified by:

isVerbose in interface IndependenceTest

Returns:

a boolean

setVerbose

public void setVerbose(boolean verbose)

Sets the verbose flag.

Specified by:

setVerbose in interface IndependenceTest

Parameters:

verbose - True if verbose mode is enabled, false otherwise.