Package weka.experiment

Class PairedStats

java.lang.Object
weka.experiment.PairedStats
All Implemented Interfaces:
RevisionHandler
Direct Known Subclasses:
PairedStatsCorrected
public class PairedStats extends Object implements RevisionHandler
A class for storing stats on a paired comparison (t-test and correlation)
Version:
$Revision: 14314 $
Author:
Len Trigg (trigg@cs.waikato.ac.nz)

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    double
    correlation
    The correlation coefficient
    double
    count
    The number of data points seen
    double
    differencesProbability
    The probability of obtaining the observed differences
    int
    differencesSignificance
    A significance indicator: 0 if the differences are not significant > 0 if x significantly greater than y < 0 if x significantly less than y
    Stats
    differencesStats
    The stats associated with the paired differences
    double
    sigLevel
    The significance level for comparisons
    Stats
    xStats
    The stats associated with the data in column 1
    double
    xySum
    The sum of the products
    Stats
    yStats
    The stats associated with the data in column 2

  • Constructor Summary

    Constructors
    Constructor
    Description
    PairedStats(double sig)
    Creates a new PairedStats object with the supplied significance level.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    add(double[] value1, double[] value2)
    Adds an array of observed pair of values.
    void
    add(double value1, double value2)
    Add an observed pair of values.
    void
    calculateDerived()
    Calculates the derived statistics (significance etc).
    int
    getDegreesOfFreedom()
    Gets the degrees of freedom.
    String
    getRevision()
    Returns the revision string.
    static void
    main(String[] args)
    Tests the paired stats object from the command line.
    void
    setDegreesOfFreedom(int d)
    Sets the degrees of freedom (if calibration is required).
    void
    subtract(double[] value1, double[] value2)
    Removes an array of observed pair of values.
    void
    subtract(double value1, double value2)
    Removes an observed pair of values.
    String
    toString()
    Returns statistics on the paired comparison.

    Methods inherited from class java.lang.Object

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

  • Field Details

    • xStats

      public Stats xStats
      The stats associated with the data in column 1

    • yStats

      public Stats yStats
      The stats associated with the data in column 2

    • differencesStats

      public Stats differencesStats
      The stats associated with the paired differences

    • differencesProbability

      public double differencesProbability
      The probability of obtaining the observed differences

    • correlation

      public double correlation
      The correlation coefficient

    • xySum

      public double xySum
      The sum of the products

    • count

      public double count
      The number of data points seen

    • differencesSignificance

      public int differencesSignificance
      A significance indicator: 0 if the differences are not significant > 0 if x significantly greater than y < 0 if x significantly less than y

    • sigLevel

      public double sigLevel
      The significance level for comparisons

  • Constructor Details

    • PairedStats

      public PairedStats(double sig)
      Creates a new PairedStats object with the supplied significance level.
      Parameters:
      sig - the significance level for comparisons

  • Method Details

    • setDegreesOfFreedom

      public void setDegreesOfFreedom(int d)
      Sets the degrees of freedom (if calibration is required).

    • getDegreesOfFreedom

      public int getDegreesOfFreedom()
      Gets the degrees of freedom.

    • add

      public void add(double value1, double value2)
      Add an observed pair of values.
      Parameters:
      value1 - the value from column 1
      value2 - the value from column 2

    • subtract

      public void subtract(double value1, double value2)
      Removes an observed pair of values.
      Parameters:
      value1 - the value from column 1
      value2 - the value from column 2

    • add

      public void add(double[] value1, double[] value2)
      Adds an array of observed pair of values.
      Parameters:
      value1 - the array containing values from column 1
      value2 - the array containing values from column 2

    • subtract

      public void subtract(double[] value1, double[] value2)
      Removes an array of observed pair of values.
      Parameters:
      value1 - the array containing values from column 1
      value2 - the array containing values from column 2

    • calculateDerived

      public void calculateDerived()
      Calculates the derived statistics (significance etc).

    • toString

      public String toString()
      Returns statistics on the paired comparison.
      Overrides:
      toString in class Object
      Returns:
      the t-test statistics as a string

    • getRevision

      public String getRevision()
      Returns the revision string.
      Specified by:
      getRevision in interface RevisionHandler
      Returns:
      the revision

    • main

      public static void main(String[] args)
      Tests the paired stats object from the command line. reads line from stdin, expecting two values per line.
      Parameters:
      args - ignored.