org.statcato.statistics.inferential.nonparametrics

Class WilcoxonSignedRankPValue

java.lang.Object

org.statcato.statistics.inferential.nonparametrics.WilcoxonSignedRankPValue

public class WilcoxonSignedRankPValue
extends java.lang.Object

A class that computes p-values and critical values for Wilcoxon Signed Rank Test using exact and normal approximation methods.

Since:

1.0

Field Summary

Fields

Modifier and Type	Field and Description
static boolean[]	calculated One-dimensional array of boolean values indicating whether the p-values for each sample size are calculated.
static int	MAX_N The maximum sample size calculated using exact method.
static int	MAX_SUM The maximum rank sum given the maximum sample size.
static double[][]	pvalue Two-dimensional array of double values representing the cumulative p-values of each rank sum corresponding to the sample size.
static int[][]	sum Two-dimensional array of integers representing the number of occurrences of each rank sum corresponding to the sample size.

Constructor Summary

Constructors

Constructor and Description
WilcoxonSignedRankPValue() Constructor.

Method Summary

Modifier and Type	Method and Description
static double	getCriticalValue(double alpha, int n) Returns the critical value corresponding to the given significance and sample size.
static double	getPValue(double s, int n) Returns the p-value corresponding to the given rank sum and sample size.

Methods inherited from class java.lang.Object

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

Field Detail

MAX_N

public static final int MAX_N

The maximum sample size calculated using exact method. Normal approximation is used for sample size greater than this number.

See Also:

Constant Field Values

calculated

public static boolean[] calculated

One-dimensional array of boolean values indicating whether the p-values for each sample size are calculated.

MAX_SUM

public static final int MAX_SUM

The maximum rank sum given the maximum sample size.

See Also:

Constant Field Values

sum

public static int[][] sum

Two-dimensional array of integers representing the number of occurrences of each rank sum corresponding to the sample size. sum[i][j] = number of occurrences of rank sum j for sample size i.

pvalue

public static double[][] pvalue

Two-dimensional array of double values representing the cumulative p-values of each rank sum corresponding to the sample size. pvalue[i][j] = cumulative p-value of rank sum j for sample size i.

Constructor Detail

WilcoxonSignedRankPValue

public WilcoxonSignedRankPValue()

Constructor.

Method Detail

getPValue

public static double getPValue(double s,
                               int n)

Returns the p-value corresponding to the given rank sum and sample size. The exact method is used for sample size <= MAX_N, where as normal approximation is used for sample size > MAX_N.

Parameters:

s - rank sum

n - sample size

Returns:

p-value

getCriticalValue

public static double getCriticalValue(double alpha,
                                      int n)

Returns the critical value corresponding to the given significance and sample size.

Parameters:

alpha - significance

n - sample size

Returns:

critical value