org.statcato.statistics.inferential.nonparametrics

Class WilcoxonSignedRankTest

java.lang.Object

org.statcato.statistics.inferential.nonparametrics.WilcoxonSignedRankTest

public class WilcoxonSignedRankTest
extends java.lang.Object

Wilcoxon Signed Rank test. A nonparametic test for claims regarding the median of a single population. Samples are ranked by their absolute distances from the hypothesized median. The ranks of sample values that are above the hypothesized median are given positive signs; those of values below the hypothesized median are given negative signs. The sums of the ranks corresponding to positive and negative signs are computed, respectively. The rank sums are used as test statistics.

Since:

1.0

Field Summary

Fields

Modifier and Type	Field and Description
static int	GREATER Alternative hypothesis type: greater than
static int	LESS Alternative hypothesis type: less than
static int	NOTEQUAL Alternative hypothesis type: not equal to
double	significance Significance of the test.

Constructor Summary

Constructors

Constructor and Description
WilcoxonSignedRankTest(java.util.Vector<java.lang.Double> data, double testMedian, int testType, double significance) Constructor, given data values.

Method Summary

Modifier and Type	Method and Description
double	getRankSum(java.util.Vector<java.lang.Double> data) Returns the rank sum of the given data (negative rank sum for right-tailed test, positive rank sum for left-tailed, and minimum of the two rank sums for two-tailed).
double	pValue() Returns the p-value.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

LESS

public static int LESS

Alternative hypothesis type: less than

GREATER

public static int GREATER

Alternative hypothesis type: greater than

NOTEQUAL

public static int NOTEQUAL

Alternative hypothesis type: not equal to

significance

public double significance

Significance of the test.

Constructor Detail

WilcoxonSignedRankTest

public WilcoxonSignedRankTest(java.util.Vector<java.lang.Double> data,
                              double testMedian,
                              int testType,
                              double significance)

Constructor, given data values.

Parameters:

data - vector of double values

testMedian - hypothesized median

testType - type of alternative hypothesis

Method Detail

pValue

public double pValue()

Returns the p-value.

Returns:

p-value

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getRankSum

public double getRankSum(java.util.Vector<java.lang.Double> data)

Returns the rank sum of the given data (negative rank sum for right-tailed test, positive rank sum for left-tailed, and minimum of the two rank sums for two-tailed).

Parameters:

data - vector of Double values

Returns:

rank sum