javanpst.distributions.tests

Class WilcoxonDistribution

java.lang.Object

javanpst.distributions.tests.WilcoxonDistribution

public class WilcoxonDistribution
extends java.lang.Object

An implementation of the Wilcoxon Signed-ranks distribution. Uses a Singleton pattern to ensure only an instance of the class is allowed.

Method Summary

Modifier and Type	Method and Description
double	computeAsymptoticDoubleTailProbability(int N, double R, double ties) Computes asymptotic double tailed p-value of the Wilcoxon distribution A ties correction of variance is incorporated.
double	computeAsymptoticLeftTailProbability(int N, double R, double ties) Computes asymptotic double tailed p-value of the Wilcoxon distribution A ties correction of variance is incorporated.
double	computeAsymptoticRightTailProbability(int N, double R, double ties) Computes asymptotic right tailed p-value of the Wilcoxon distribution A ties correction of variance is incorporated.
double	computeExactProbability(int N, double R) Computes exact p-value of the Wilcoxon distribution
static WilcoxonDistribution	getInstance() Singleton pattern access to the distribution
static Incomplete2KeyTable	getTable() Gets the table of the distribution

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static WilcoxonDistribution getInstance()

Singleton pattern access to the distribution

Returns:

the instance of the distribution

getTable

public static Incomplete2KeyTable getTable()

Gets the table of the distribution

Returns:

Reference to the table

computeExactProbability

public double computeExactProbability(int N,
                                      double R)

Computes exact p-value of the Wilcoxon distribution

Parameters:

N - n parameter

R - rank associated

Returns:

p-value computed

computeAsymptoticDoubleTailProbability

public double computeAsymptoticDoubleTailProbability(int N,
                                                     double R,
                                                     double ties)

Computes asymptotic double tailed p-value of the Wilcoxon distribution A ties correction of variance is incorporated. The array ties must be in the form {2,3,2,3} where each integer denotes the occurrence of a tie and the number of elements involved. if no ties, a void array shoud be used (i.e. ties=new int [0];)

Parameters:

N - n parameter

R - rank associated

ties - weight of ties

Returns:

p-value computed

computeAsymptoticRightTailProbability

public double computeAsymptoticRightTailProbability(int N,
                                                    double R,
                                                    double ties)

Computes asymptotic right tailed p-value of the Wilcoxon distribution A ties correction of variance is incorporated. The array ties must be in the form {2,3,2,3} where each integer denotes the occurrence of a tie and the number of elements involved. if no ties, a void array shoud be used (i.e. ties=new int [0];)

Parameters:

N - n parameter

R - rank associated

ties - weight of ties

Returns:

p-value computed

computeAsymptoticLeftTailProbability

public double computeAsymptoticLeftTailProbability(int N,
                                                   double R,
                                                   double ties)

Computes asymptotic double tailed p-value of the Wilcoxon distribution A ties correction of variance is incorporated. The array ties must be in the form {2,3,2,3} where each integer denotes the occurrence of a tie and the number of elements involved. if no ties, a void array shoud be used (i.e. ties=new int [0];)

Parameters:

N - n parameter

R - rank associated

ties - weight of ties

Returns:

p-value computed